The Big Bang Theory

258 ratings

Read reviews

Thursday at 8:00 PM on CBS

12 Seasons | 265 Episodes | Comedy | 2007

A woman who moves into an apartment across the hall from two brilliant but socially awkward physicists shows them how little they know about life outside of the laboratory.

The VCR Illumination

Season 12 Episode 10

Last episode aired on Thursday, December 6th, 2018

The Big Bang Theory - The VCR Illumination - Season 12 Episode 10

Episodes list

Season 12     
The Big Bang Theory - The Conjugal Configuration - Season 12 Episode 1

1 | The Conjugal Configuration

Monday, September 24th, 2018

Sheldon and Amy’s honeymoon runs aground in New York, while Penny and Leonard discover they are uncomfortably similar to Amy’s parents, Mr. and Mrs. Fowler. Also, Koothrappali insults physicist Neil deGrasse Tyson and starts a Twitter war.

The Big Bang Theory - The Wedding Gift Wormhole - Season 12 Episode 2

2 | The Wedding Gift Wormhole

Thursday, September 27th, 2018

Sheldon and Amy drive themselves crazy trying to figure out what “perfect gift” Leonard and Penny gave them for their wedding. Also, Koothrappali decides he wants to settle down and asks his father to arrange a marriage for him.

The Big Bang Theory - The Procreation Calculation - Season 12 Episode 3

3 | The Procreation Calculation

Thursday, October 4th, 2018

The Wolowitzes’ life gets complicated when Stuart starts bringing his new girlfriend home. Also, Penny and Leonard talk about starting a family while Koothrappali explores an arranged marriage.

The Big Bang Theory - The Tam Turbulence - Season 12 Episode 4

4 | The Tam Turbulence

Thursday, October 11th, 2018

When Sheldon won’t tell anyone why he’s never mentioned Tam, his childhood best friend, Leonard takes matters into his own hands. Also, Bernadette and Penny take out Raj’s fiancée, Anu, for dinner to get the skinny on her.

The Big Bang Theory - The Planetarium Collision - Season 12 Episode 5

5 | The Planetarium Collision

Thursday, October 18th, 2018

When Amy doesn’t have time to work on super-asymmetry, Sheldon goes to great lengths to ensure she’s available to work with him even it if means accidentally sabotaging her career in the process. Also, Koothrappali doesn’t want Wolowitz to join him in hosting a show at the planetarium.

The Big Bang Theory - The Imitation Perturbation - Season 12 Episode 6

6 | The Imitation Perturbation

Thursday, October 25th, 2018

When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny’s Halloween party. Also, Leonard is shocked that Penny doesn’t remember their first kiss.

The Big Bang Theory - The Grant Allocation Derivation - Season 12 Episode 7

7 | The Grant Allocation Derivation

Thursday, November 1st, 2018

Leonard is caught between a rock and a hard place when he’s responsible for distributing extra grant money. Also, Bernadette turns the backyard playhouse into a hideaway from her husband and kids.

The Big Bang Theory - The Consummation Deviation - Season 12 Episode 8

8 | The Consummation Deviation

Thursday, November 8th, 2018

Sheldon tries to bond with Amy’s father, but when Wolowitz lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond with Mrs. Fowler. Also, Koothrappali and Anu try to get physical for the first time.

The Big Bang Theory - The Citation Negation - Season 12 Episode 9

9 | The Citation Negation

Thursday, November 15th, 2018

Sheldon and Amy are devastated after learning from a Russian paper that Super Asymmetry has already been discovered and disproven. Also, ultra-competitive Bernadette asks Stuart’s girlfriend, Denise, to teach her how to beat Howard in a popular videogame.

The Big Bang Theory - The VCR Illumination - Season 12 Episode 10

10 | The VCR Illumination

Thursday, December 6th, 2018

Sheldon and Amy are still down about their theory being disproven, but a VHS tape from Sheldon’s past inspires him not to give up. Also, Bernadette turns into a pageant mom when she tries to help Wolowitz ace his Magic Castle audition.

The Big Bang Theory - The Proposal Proposal - Season 11 Episode 1

1 | The Proposal Proposal

Monday, September 25th, 2017

Amy enthusiastically accepts Sheldon's marriage proposal. However, when dining with Amy's colleagues later that night, Sheldon is offended that they are more impressed with Amy's work than his own. With help from Stephen Hawking, Sheldon later comes to grips with the fact that he will not always be the center of attention in the marriage. Bernadette is shocked to realize that she is pregnant again. She and Howard are not thrilled at the idea of having another baby so soon after their first. They attempt to convince Leonard and Penny to have a child as well, but are rebuffed.

The Big Bang Theory - The Retraction Reaction - Season 11 Episode 2

2 | The Retraction Reaction

Monday, October 2nd, 2017

Leonard angers the university - and the entire physics community - after he gives an embarrassing interview. Also, Amy and Bernadette bond over having to hide their success from Sheldon and Howard.

The Big Bang Theory - The Relaxation Integration - Season 11 Episode 3

3 | The Relaxation Integration

Monday, October 9th, 2017

As Sheldon stresses about picking a wedding date, Amy tries to convince him he has a more laid-back side. Also, Koothrappali and Stuart compete to win the heart of Bernadette's new coworker, Ruchi.

The Big Bang Theory - The Explosion Implosion - Season 11 Episode 4

4 | The Explosion Implosion

Monday, October 16th, 2017

Wolowitz and Sheldon bond when they drive to the desert to shoot off a model rocket. Also, when Leonard's mom, Beverly, finds a new best friend in Penny, it rubs Leonard the wrong way.

The Big Bang Theory - The Collaboration Contamination - Season 11 Episode 5

5 | The Collaboration Contamination

Monday, October 23rd, 2017

Sheldon and Koothrappali confide in Bernadette when they can't handle Amy and Wolowitz working together. Also, Penny and Leonard learn new tactics for how to deal Sheldon from an unlikely source.

The Big Bang Theory - The Proton Regeneration - Season 11 Episode 6

6 | The Proton Regeneration

Thursday, November 2nd, 2017

Sheldon goes head-to-head with Wil Wheaton for the role of the new Professor Proton. Also, Penny steps in to take care of Halley when Bernadette and Wolowitz both wind up on bed rest.

The Big Bang Theory - The Geology Methodology - Season 11 Episode 7

7 | The Geology Methodology

Thursday, November 9th, 2017

Sheldon and Bert collaborate on a research project, despite Sheldon's embarrassment. Also, Penny and Bernadette coach Koothrappali on how to navigate his relationship with Ruchi.

The Big Bang Theory - The Tesla Recoil - Season 11 Episode 8

8 | The Tesla Recoil

Thursday, November 16th, 2017

Leonard and Wolowitz are furious after they learn Sheldon went to work with the military behind their backs. Also, while Bernadette is on bed rest, she asks Raj to do some digging when she suspects Ruchi is trying to steal her job.

The Big Bang Theory - The Bitcoin Entanglement - Season 11 Episode 9

9 | The Bitcoin Entanglement

Thursday, November 30th, 2017

Sheldon tries to teach the guys a lesson after they cut him out of a potentially valuable Bitcoin investment. Also, a seven-year-old video reveals a secret about Leonard and Penny's relationship.

The Big Bang Theory - The Confidence Erosion - Season 11 Episode 10

10 | The Confidence Erosion

Thursday, December 7th, 2017

Sheldon and Amy try to eliminate stress from wedding planning by applying math to the process. Koothrappali “breaks up” with Wolowitz after realizing his best friend is actually hurting his confidence.

The Big Bang Theory - The Celebration Reverberation - Season 11 Episode 11

11 | The Celebration Reverberation

Thursday, December 14th, 2017

Sheldon and Wolowitz plan birthday celebrations for Amy and Halley, respectively. Also, Leonard receives a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.

The Big Bang Theory - The Matrimonial Metric - Season 11 Episode 12

12 | The Matrimonial Metric

Thursday, January 4th, 2018

To discover who would be most qualified to be best man and maid of honor at their wedding, Sheldon and Amy subject their friends to a series of secret experiments. Also, Penny reveals her true feelings about Amy.

The Big Bang Theory - The Solo Oscillation - Season 11 Episode 13

13 | The Solo Oscillation

Thursday, January 11th, 2018

When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Also, Bert the geologist replaces Wolowitz in the band Footprints on the Moon, and Sheldon finds Penny a surprising source of scientific inspiration.

The Big Bang Theory - The Separation Triangulation - Season 11 Episode 14

14 | The Separation Triangulation

Thursday, January 18th, 2018

Koothrappali finds himself in the middle of domestic drama when he learns the woman he's dating, Nell, has a very upset husband, Oliver. Also, when Sheldon rents his old room back for a quiet place to work, he drives Leonard crazy by being a model tenant.

The Big Bang Theory - The Novelization Correlation - Season 11 Episode 15

15 | The Novelization Correlation

Thursday, February 1st, 2018

When Sheldon petitions Wil Wheaton to appear on the new Professor Proton show, Wil offers a role to Amy instead. Also, Penny gets angry when she thinks the female protagonist in Leonard's novel is based on her.

The Big Bang Theory - The Neonatal Nomenclature - Season 11 Episode 16

16 | The Neonatal Nomenclature

Thursday, March 1st, 2018

When Bernadette won't go into labor, all her friends try different tactics to get things started. Also, Wolowitz confronts Bernadette after Amy accidentally reveals she's already chosen their son's name.

The Big Bang Theory - The Athenaeum Allocation - Season 11 Episode 17

17 | The Athenaeum Allocation

Thursday, March 8th, 2018

Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy. Also, Bernadette and Wolowitz have a hard time deciding who should stay at home with the kids and who should go back to work.

The Big Bang Theory - The Gates Excitation - Season 11 Episode 18

18 | The Gates Excitation

Thursday, March 29th, 2018

Penny gets the opportunity to host Bill Gates at work when his company wants to partner with her pharmaceutical company. Also, Leonard, Koothrappali and Wolowitz do everything in their power to meet him, while Sheldon thinks he is the victim of an April Fools prank.

The Big Bang Theory - The Tenant Disassociation - Season 11 Episode 19

19 | The Tenant Disassociation

Thursday, April 5th, 2018

When Leonard learns Sheldon is the president of the tenants association, he decides to run against him. Also, Bernadette encourages Wolowitz and Koothrappali to find the owner of a drone after they find it in the backyard.

The Big Bang Theory - The Reclusive Potential - Season 11 Episode 20

20 | The Reclusive Potential

Thursday, April 12th, 2018

Sheldon takes the guys to a cabin in the middle of nowhere to meet a reclusive scientist; Penny and Bernadette improvise Amy's bachelorette party.

The Big Bang Theory - The Comet Polarization - Season 11 Episode 21

21 | The Comet Polarization

Thursday, April 19th, 2018

Sheldon’s comic book store experiences changes when writer Neil Gaiman puts Stuart’s store on the map. Also, Koothrappali takes credit for Penny’s astronomical discovery, and friendships are threatened.

The Big Bang Theory - The Monetary Insufficiency - Season 11 Episode 22

22 | The Monetary Insufficiency

Thursday, April 26th, 2018

Sheldon goes to Vegas to win money for science. Also, Penny and Bernadette take Amy wedding dress shopping, but her terrible choice entangles them in a web of lies.

The Big Bang Theory - The Sibling Realignment - Season 11 Episode 23

23 | The Sibling Realignment

Thursday, May 3rd, 2018

When Sheldon learns that his mother won’t attend his wedding unless he invites his brother, Georgie, he and Leonard travel to Texas to end a family feud. Also, the Wolowitz kids inadvertently infects Amy, Bernadette, Wolowitz and Koothrappali with pinkeye.

The Big Bang Theory - The Bow Tie Asymmetry - Season 11 Episode 24

24 | The Bow Tie Asymmetry

Thursday, May 10th, 2018

When Amy’s parents and Sheldon’s family arrive for the wedding, everybody is focused on making sure all goes according to plan – everyone except the bride and groom.

The Big Bang Theory - The Conjugal Conjecture - Season 10 Episode 1

1 | The Conjugal Conjecture

Monday, September 19th, 2016

After Leonard's father, Alfred and Sheldon's mother, Mary share an evening together, everyone deals with an awkward morning the following day. Also, Penny's family arrives for the ceremony, including her anxiety-ridden mother, Susan, and her drug dealing brother, Randall.

The Big Bang Theory - The Military Miniaturization - Season 10 Episode 2

2 | The Military Miniaturization

Monday, September 26th, 2016

The Air Force shows interest in the guidance system and Penny lets it slip at work that Bernadette is expecting.

The Big Bang Theory - The Dependence Transcendence - Season 10 Episode 3

3 | The Dependence Transcendence

Monday, October 3rd, 2016

Sheldon can't keep up with the late nights Howard and Leonard are putting in, Raj spends the day with a pregnant Bernadette and Penny and Amy attend a faculty party.

The Big Bang Theory - The Cohabitation Experimentation - Season 10 Episode 4

4 | The Cohabitation Experimentation

Monday, October 10th, 2016

When Amy's apartment floods, she proposes a "cohabitation experiment" with Sheldon. Also, Howard and Bernadette are upset when Koothrappali learns the gender of the baby before they do.

The Big Bang Theory - The Hot Tub Contamination - Season 10 Episode 5

5 | The Hot Tub Contamination

Monday, October 17th, 2016

Leonard and Penny must separate a quarreling Sheldon and Amy when their cohabitation does not go as planned, and Sheldon threatens to break off their relationship when Amy refuses to adhere to the bathroom schedule. Also, Howard and Bernadette find unexpected guests at their house when they decide to stay home from a planned vacation.

The Big Bang Theory - The Fetal Kick Catalyst - Season 10 Episode 6

6 | The Fetal Kick Catalyst

Thursday, October 27th, 2016

Penny is surprised to learn she has fans of her performance in "Serial Ape-ist" when she attends Van Nuys Comic Con with Leonard. Also, Amy hosts a Sheldon-style brunch at Penny’s apartment, and Wolowitz makes an impulsive purchase when he starts stressing out about the baby on the way.

The Big Bang Theory - The Veracity Elasticity - Season 10 Episode 7

7 | The Veracity Elasticity

Thursday, November 3rd, 2016

In order to continue living with Sheldon, Amy lies to him about repairs being made to her apartment and they host an "on location" episode of "Fun With Flags" in Penny’s apartment. Also, Leonard lets Penny decorate Sheldon’s old room after he learns that she has been secretly moving Leonard’s collectibles into storage.

The Big Bang Theory - The Brain Bowl Incubation - Season 10 Episode 8

8 | The Brain Bowl Incubation

Thursday, November 10th, 2016

After a successful experiment combining their genes, Sheldon will stop at nothing to convince Amy they should procreate. Also, Koothrappali is embarrassed to tell the gang what the new woman he’s dating does for a living.

The Big Bang Theory - The Geology Elevation - Season 10 Episode 9

9 | The Geology Elevation

Thursday, November 17th, 2016

When Bert, a Caltech geologist, wins the MacArthur Genius fellowship, Sheldon is overcome with jealousy. Also, Wolowitz finds an old remote control Stephen Hawking action figure he invented.

The Big Bang Theory - The Property Division Collision - Season 10 Episode 10

10 | The Property Division Collision

Thursday, December 1st, 2016

Sheldon and Leonard must divide up their possessions and remove Penny's things from 4B.

The Big Bang Theory - The Birthday Synchronicity - Season 10 Episode 11

11 | The Birthday Synchronicity

Thursday, December 15th, 2016

Amy's desire to have an intimate night with Sheldon on her birthday is interrupted by Bernadette going into labor.

The Big Bang Theory - The Holiday Summation - Season 10 Episode 12

12 | The Holiday Summation

Thursday, January 5th, 2017

Sheldon and Amy visit Leonard and Penny for the first time since the holidays and share details about their terrible trip to Texas.

The Big Bang Theory - The Romance Recalibration - Season 10 Episode 13

13 | The Romance Recalibration

Thursday, January 19th, 2017

When Penny feels that Leonard is taking her for granted, she decides to go on a spa weekend with Amy. Also, Wolowitz and Koothrappali try to fix a squeaky floorboard in the baby's room.

The Big Bang Theory - The Emotion Detection Automation - Season 10 Episode 14

14 | The Emotion Detection Automation

Thursday, February 2nd, 2017

Sheldon beta-tests an MIT invention after hearing it can help him read people's emotions. Also, Leonard can't hide his feelings when Penny announces her brother is coming to town, and Raj invites his ex-girlfriends over to give him dating advice.

The Big Bang Theory - The Locomotion Reverberation - Season 10 Episode 15

15 | The Locomotion Reverberation

Thursday, February 9th, 2017

Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system. Also, Penny and Amy take Bernadette out for the night, leaving Raj and Stuart to care for baby Halley.

The Big Bang Theory - The Allowance Evaporation - Season 10 Episode 16

16 | The Allowance Evaporation

Thursday, February 16th, 2017

Sheldon and Amy have their first fight since moving in together and Koothrappali is shocked at the realities of financial independence when he stops receiving support from his father.

The Big Bang Theory - The Comic-Con Conundrum - Season 10 Episode 17

17 | The Comic-Con Conundrum

Thursday, February 23rd, 2017

The guys' annual trip to Comic Con is in doubt when Raj can't afford to go.

The Big Bang Theory - The Escape Hatch Identification - Season 10 Episode 18

18 | The Escape Hatch Identification

Thursday, March 9th, 2017

Raj searches for a cheaper living arrangement.

The Big Bang Theory - The Collaboration Fluctuation - Season 10 Episode 19

19 | The Collaboration Fluctuation

Thursday, March 30th, 2017

Leonard, Penny and Raj adjust to their new living arrangement and Sheldon takes an interest in Amy's work.

The Big Bang Theory - The Recollection Dissipation - Season 10 Episode 20

20 | The Recollection Dissipation

Thursday, April 6th, 2017

Sheldon pushes himself to the limit when he collaborates on projects with Leonard and Wolowitz as well as Amy on the same day. Also, Bernadette is nearing the end of her maternity leave and must return to work.

The Big Bang Theory - The Separation Agitation - Season 10 Episode 21

21 | The Separation Agitation

Thursday, April 13th, 2017

Howard and Bernadette have a hard time leaving Halley in day care when Bernadette returns to work. Also, Bert introduces the gang to his new girlfriend, Rebecca.

The Big Bang Theory - The Cognition Regeneration - Season 10 Episode 22

22 | The Cognition Regeneration

Thursday, April 27th, 2017

Leonard isn’t thrilled when Penny considers taking a new job offered by her ex-boyfriend, Zack.

The Big Bang Theory - The Gyroscopic Collapse - Season 10 Episode 23

23 | The Gyroscopic Collapse

Thursday, May 4th, 2017

Amy is offered a Fellowship at Princeton, Raj makes new living arrangements, and the gyroscope project is spinning out of control!

The Big Bang Theory - The Long Distance Dissonance - Season 10 Episode 24

24 | The Long Distance Dissonance

Thursday, May 11th, 2017

The gang is concerned when Sheldon’s former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.

The Big Bang Theory - The Matrimonial Momentum - Season 9 Episode 1

1 | The Matrimonial Momentum

Monday, September 21st, 2015

Sheldon is confronted by a mystery of the universe he cannot unravel: when a woman wants time apart to think, exactly how much time does that mean, and is there any way to hurry the process along? In Las Vegas, Penny and Leonard march closer to marching down the aisle, but has Penny gotten over Leonard’s infidelity? And if so, will he do anything to un-get her over it?

The Big Bang Theory - The Separation Oscillation - Season 9 Episode 2

2 | The Separation Oscillation

Monday, September 28th, 2015

Leonard confronts the woman he kissed on the North Sea in an attempt to set Penny’s mind at ease. Also, Sheldon films a special episode of “Fun with Flags” after his breakup with Amy, and Bernadette feels guilty about withholding a secret from Penny.

The Big Bang Theory - The Bachelor Party Corrosion - Season 9 Episode 3

3 | The Bachelor Party Corrosion

Monday, October 5th, 2015

The guys’ science skills are put to the test when they get a flat tire during Leonard’s bachelor party weekend in Mexico. Also, the girls force Penny to finally tell her family that she eloped with Leonard.

The Big Bang Theory - The 2003 Approximation - Season 9 Episode 4

4 | The 2003 Approximation

Monday, October 12th, 2015

Leonard and Penny finally move in together leaving Sheldon very upset with this big change in his life and wishing he could go back to a time when he had no emotions in 2003 before he met Leonard. Raj, Howard and Stuart attempt to form a band.

The Big Bang Theory - The Perspiration Implementation - Season 9 Episode 5

5 | The Perspiration Implementation

Monday, October 19th, 2015

The guys take a fencing lesson from Barry Kripke and Sheldon finds himself in an awkward position when Kripke expresses interest in Amy. Also, when Stuart struggles to get female customers at the Comic Book Store, Penny, Amy and Bernadette come by to help him out.

The Big Bang Theory - The Helium Insufficiency - Season 9 Episode 6

6 | The Helium Insufficiency

Monday, October 26th, 2015

In the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man.

The Big Bang Theory - The Spock Resonance - Season 9 Episode 7

7 | The Spock Resonance

Thursday, November 5th, 2015

Adam Nimoy, friend of Wil Wheaton and son of Leonard Nimoy, interviews Sheldon for a Star Trek documentary. Sheldon gets off topic and ends up revealing an engagement ring and his plan to propose to Amy. Bernadette wants to start renovating the house and the issue of starting a family with Howard is brought up.

The Big Bang Theory - The Mystery Date Observation - Season 9 Episode 8

8 | The Mystery Date Observation

Thursday, November 12th, 2015

Amy has a formal date which Leonard, Penny and Bernadette secretly spy on. Sheldon has Howard and Raj help him find a new girlfriend since they found Amy for him.

The Big Bang Theory - The Platonic Permutation - Season 9 Episode 9

9 | The Platonic Permutation

Thursday, November 19th, 2015

It’s Thanksgiving. Sheldon and Amy go on a lunch date to the aquarium as friends. Howard, Bernadette, Raj and Emily help out at a soup kitchen. Leonard and Penny make their first Thanksgiving dinner as a married couple.

The Big Bang Theory - The Earworm Reverberation - Season 9 Episode 10

10 | The Earworm Reverberation

Thursday, December 10th, 2015

Sheldon has a revelation when he realizes why a song was stuck in his head. Also, Amy invites Dave over for dinner despite their previously awkward date, and Wolowitz and Koothrappali become obsessed with a fan of their band, "Footprints on the Moon".

The Big Bang Theory - The Opening Night Excitation - Season 9 Episode 11

11 | The Opening Night Excitation

Thursday, December 17th, 2015

As the guys prepare to go to the premiere of the new Star Wars movie, Sheldon plans a special event for Amy's birthday.

The Big Bang Theory - The Sales Call Sublimation - Season 9 Episode 12

12 | The Sales Call Sublimation

Thursday, January 7th, 2016

Leonard visits a psychiatrist so Penny can make a sales call. Stuart moves out of the Wolowitz house. Sheldon works with Raj looking for extra-solar planets.

The Big Bang Theory - The Empathy Optimization - Season 9 Episode 13

13 | The Empathy Optimization

Thursday, January 14th, 2016

The gang decides to head to Vegas for the week on a party bus. Sheldon learns about the importance of empathy and saying sorry.

The Big Bang Theory - The Meemaw Materialization - Season 9 Episode 14

14 | The Meemaw Materialization

Thursday, February 4th, 2016

Sheldon is thrilled when his Meemaw comes to visit, but his excitement quickly fades when she butts heads with Amy. Also, Raj meets a new girl at the comic book store who makes him question his relationship with Emily.

The Big Bang Theory - The Valentino Submergence - Season 9 Episode 15

15 | The Valentino Submergence

Thursday, February 11th, 2016

Sheldon and Amy host a live Valentine's Day episode of Fun with Flags, Leonard and Penny grapple with getting older, Howard and Bernadette find a surprise in their hot tub and Raj is torn between Emily and the cute girl he met at the Comic Bookstore.

The Big Bang Theory - The Positive Negative Reaction - Season 9 Episode 16

16 | The Positive Negative Reaction

Thursday, February 18th, 2016

When the gang finds out about Bernadette's pregnancy, they celebrate by singing karaoke. Also, Bernadette is concerned when Wolowitz freaks out over her pregnancy announcement, and Wolowitz is convinced he must make more money to provide for a baby.

The Big Bang Theory - The Celebration Experimentation - Season 9 Episode 17

17 | The Celebration Experimentation

Thursday, February 25th, 2016

After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.

The Big Bang Theory - The Application Deterioration - Season 9 Episode 18

18 | The Application Deterioration

Thursday, March 10th, 2016

Sheldon works up a contract to split their portion of their guidance system invention royalties, but Bernadette does not like how it's done. Raj must again decide between Emily and Claire when they both contact him.

The Big Bang Theory - The Solder Excursion Diversion - Season 9 Episode 19

19 | The Solder Excursion Diversion

Thursday, March 31st, 2016

Amy is shocked at a revelation from Sheldon after she buys him a new laptop. Koothrappali sells out Leonard and Wolowitz after they lie to their wives in order to attend an early screening of a movie.

The Big Bang Theory - The Big Bear Precipitation - Season 9 Episode 20

20 | The Big Bear Precipitation

Thursday, April 7th, 2016

Secrets are revealed when Amy and Sheldon join Penny and Leonard on a weekend cabin trip. Raj is more excited about Howard's and Bernadette's impending parenthood than they are.

The Big Bang Theory - The Viewing Party Combustion - Season 9 Episode 21

21 | The Viewing Party Combustion

Thursday, April 21st, 2016

Everyone must choose sides when a small argument between Leonard and Sheldon erupts into a heated fight during a group get-together.

The Big Bang Theory - The Fermentation Bifurcation - Season 9 Episode 22

22 | The Fermentation Bifurcation

Thursday, April 28th, 2016

Sheldon and Bernadette spend a night together while the rest of the gang goes to a wine tasting party, but things get uncomfortable for Raj when Zack also attends and takes an interest in Claire.

The Big Bang Theory - The Line Substitution Solution - Season 9 Episode 23

23 | The Line Substitution Solution

Thursday, May 5th, 2016

Sheldon hires Stuart to spend the day with Amy when he’d rather go to a movie screening. Also, Leonard’s mother, Beverly, comes to town and Penny struggles to make a connection with her.

The Big Bang Theory - The Convergence Convergence - Season 9 Episode 24

24 | The Convergence Convergence

Thursday, May 12th, 2016

Leonard and Penny get remarried in front of their friends (who show up), Leonard's parents, Beverly and Alfred (Judd Hirsch) and Sheldon's mother, Mary, who finds something in common with Alfred. Howard gets an unknown email from the Air Force about his invention.

The Big Bang Theory - The Locomotion Interruption - Season 8 Episode 1

1 | The Locomotion Interruption

Monday, September 22nd, 2014

Leonard and Amy make an unexpected trip to Arizona to fetch Sheldon; Penny interviews for a job at Bernadette's company; Stuart's relationship with Mrs. Wolowitz disturbs Howard.

The Big Bang Theory - The Junior Professor Solution - Season 8 Episode 2

2 | The Junior Professor Solution

Monday, September 22nd, 2014

When Sheldon must teach a class, Howard decides to take it; Amy takes advantage of the tension between Penny and Bernadette.

The Big Bang Theory - The First Pitch Insufficiency - Season 8 Episode 3

3 | The First Pitch Insufficiency

Monday, September 29th, 2014

Wolowitz feels nervous when he is asked to throw the first pitch at a Los Angeles Angels game; Penny and Leonard want to prove Sheldon wrong after he says he and Amy are the better couple.

The Big Bang Theory - The Hook-Up Reverberation - Season 8 Episode 4

4 | The Hook-Up Reverberation

Monday, October 6th, 2014

Raj's honesty comes back to haunt him when his new girlfriend is unfriendly to Penny; the guys think about becoming part owners in Stuart's store.

The Big Bang Theory - The Focus Attenuation - Season 8 Episode 5

5 | The Focus Attenuation

Monday, October 13th, 2014

During their weekend in Las Vegas, Bernadette and Amy accuse Penny of being a buzz kill; the guys try to invent the next big thing.

The Big Bang Theory - The Expedition Approximation - Season 8 Episode 6

6 | The Expedition Approximation

Monday, October 20th, 2014

Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel deep underground. Leonard and Penny seek advice from Howard and Bernadette after they fight about money.

The Big Bang Theory - The Misinterpretation Agitation - Season 8 Episode 7

7 | The Misinterpretation Agitation

Thursday, October 30th, 2014

The guys try to help Penny out of an awkward work dilemma, when a smitten doctor shows up at her door after her flirtatious sales techniques work a little too well. Meanwhile, Amy and Bernadette argue over whether or not female scientists should play up their sexuality.

The Big Bang Theory - The Prom Equivalency - Season 8 Episode 8

8 | The Prom Equivalency

Thursday, November 6th, 2014

When the gang recreates a high-school prom night on the roof of the guys'; apartment building, Sheldon feels pressure to participate in all the typical romantic traditions.

The Big Bang Theory - The Septum Deviation - Season 8 Episode 9

9 | The Septum Deviation

Thursday, November 13th, 2014

When Leonard gets minor surgery on his nose, Sheldon is the one in need of sympathy. Meanwhile, Raj's parents' impending divorce causes Howard and Bernadette to work on their own marriage.

The Big Bang Theory - The Champagne Reflection - Season 8 Episode 10

10 | The Champagne Reflection

Thursday, November 20th, 2014

While Sheldon says a tearful goodbye to the final instalment of "Fun with Flags", Leonard, Howard and Raj search for something significant in a dead professor's research. And Bernadette is shocked to learn of her co-workers’ true feelings from Penny.

The Big Bang Theory - The Clean Room Infiltration - Season 8 Episode 11

11 | The Clean Room Infiltration

Thursday, December 11th, 2014

Leonard and Howard turn to Raj for help in dealing with a work emergency when they nearly come to blows after blaming each other for a potential disaster at the university. Amy throws an authentic Victorian Christmas party, while Sheldon seeks revenge on her for making him celebrate the holidays.

The Big Bang Theory - The Space Probe Disintegration - Season 8 Episode 12

12 | The Space Probe Disintegration

Thursday, December 18th, 2014

Wolowitz tries to distract Raj, who is anxiously awaiting data from a space probe he helped launch. Meanwhile, Sheldon and Leonard go dress shopping with Penny and Amy.

The Big Bang Theory - The Anxiety Optimization - Season 8 Episode 13

13 | The Anxiety Optimization

Thursday, January 29th, 2015

The gang tries to help Sheldon when he becomes stuck in a rut at work by increasing his anxiety level. Howard teases Raj with a new game called "Cinnamon or Emily?"

The Big Bang Theory - The Troll Manifestation - Season 8 Episode 14

14 | The Troll Manifestation

Thursday, February 5th, 2015

Leonard and Sheldon publish a paper which is widely accepted except for comments from an internet troll. Meanwhile, the girls reminisce about embarassing incidents from their past.

The Big Bang Theory - The Comic Book Store Regeneration - Season 8 Episode 15

15 | The Comic Book Store Regeneration

Thursday, February 19th, 2015

Wolowitz receives some shocking news as everyone prepares for the reopening of Stuart’s comic book store. Penny teaches Sheldon how to “let it go,” but can’t follow her own advice after she learns something infuriating about Amy. Also, Leonard and Raj think they spot Nathan Fillion at a restaurant.

The Big Bang Theory - The Intimacy Acceleration - Season 8 Episode 16

16 | The Intimacy Acceleration

Thursday, February 26th, 2015

As a joke, Sheldon and Penny try an experiment designed to make participants fall in love. Also, Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a “zombie.” And, after returning from Mrs. Wolowitz’ funeral, Bernadette and Howard run into trouble at the airport.

The Big Bang Theory - The Colonization Application - Season 8 Episode 17

17 | The Colonization Application

Thursday, March 5th, 2015

Trouble arises when Amy learns Sheldon has applied for a one-way mission to colonize Mars. Also, a trip to the pet store ends in a fight for Sheldon and Amy, Leonard surprises Penny with a very “adult” purchase, and Raj is caught snooping in Emily’s apartment.

The Big Bang Theory - The Leftover Thermalization - Season 8 Episode 18

18 | The Leftover Thermalization

Thursday, March 12th, 2015

Friction ensues when a magazine fails to mention Leonard in an article about the paper he co-wrote with Sheldon. Also, a blackout at Mrs. Wolowitz’s home leads to a final family dinner in her honor.

The Big Bang Theory - The Skywalker Incursion - Season 8 Episode 19

19 | The Skywalker Incursion

Thursday, April 2nd, 2015

When Leonard and Sheldon are invited to speak at UC Berkeley, they take a detour to try to meet an idol. Also, when Bernadette and Howard battle over the fate of his Doctor Who TARDIS, Raj and Amy offer to settle the dispute with a game of ping pong.

The Big Bang Theory - The Fortification Implementation - Season 8 Episode 20

20 | The Fortification Implementation

Thursday, April 9th, 2015

When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship. Also, Wolowitz meets the half-brother he never knew he had, and when Penny is invited to appear on Wil Wheaton’s podcast, she and Leonard have a huge, on-air argument.

The Big Bang Theory - The Communication Deterioration - Season 8 Episode 21

21 | The Communication Deterioration

Thursday, April 16th, 2015

When Raj is asked to create a message in case a NASA mission discovers alien life, the guys fight over what he should do. Also, Penny is torn between auditioning for a movie or keeping her successful pharmaceutical sales job.

The Big Bang Theory - The Graduation Transmission - Season 8 Episode 22

22 | The Graduation Transmission

Thursday, April 23rd, 2015

Wolowitz questions his engineering abilities when he and Sheldon can’t get a toy drone to fly. Meanwhile, a cancelled flight nearly prevents Leonard from giving the commencement address at his former high school, and Raj pits his parents against each other when his father cuts him off financially.

The Big Bang Theory - The Maternal Combustion - Season 8 Episode 23

23 | The Maternal Combustion

Thursday, April 30th, 2015

Personalities collide when Sheldon and Leonard’s mothers finally meet. Meanwhile, Howard finally decides to “man up” and do his fair share of the housework – but not without a little help from his friends.

The Big Bang Theory - The Commitment Determination - Season 8 Episode 24

24 | The Commitment Determination

Thursday, May 7th, 2015

Sheldon pushes Leonard and Penny to choose a date for their wedding and deals with dramatic changes in his own relationship with Amy.

The Big Bang Theory - The Hofstadter Insufficiency - Season 7 Episode 1

1 | The Hofstadter Insufficiency

Thursday, September 26th, 2013

In the first part of the one-hour seventh season premiere, Sheldon and Penny bond in Leonard's absence, but it's Sheldon's feelings that are crushed when Leonard returns from the North Sea. Guest star Regina King returns as Mrs. Davis, the University's Director of Employee Relations.

The Big Bang Theory - The Deception Verification - Season 7 Episode 2

2 | The Deception Verification

Thursday, September 26th, 2013

On the second part of the one-hour seventh season premiere, Raj gets consoled about his ex-girlfriend and Howard's relationship with his mother causes an unusual threat to his masculinity. Kevin Sussman returns as Stuart, the comic book store owner.

The Big Bang Theory - The Scavenger Vortex - Season 7 Episode 3

3 | The Scavenger Vortex

Thursday, October 3rd, 2013

When the entire gang competes in a cutthroat scavenger hunt designed by Raj that tests their science knowledge and street smarts, it brings out the best – and worst – in everyone.

The Big Bang Theory - The Raiders Minimization - Season 7 Episode 4

4 | The Raiders Minimization

Thursday, October 10th, 2013

After Amy ruins one of Sheldon's favorite movies – Raiders of the Lost Ark – he gets defensive, seeking revenge. Meanwhile, Leonard discovers a way to get Penny to do anything; and Raj and Stuart create online dating profiles.

The Big Bang Theory - The Workplace Proximity - Season 7 Episode 5

5 | The Workplace Proximity

Thursday, October 17th, 2013

Sheldon must decide how much "Amy time" is too much after she takes a job at his university, and their relationship is put to the test. Meanwhile, Howard finds himself sleeping on Raj's couch after a fight with Bernadette.

The Big Bang Theory - The Romance Resonance - Season 7 Episode 6

6 | The Romance Resonance

Thursday, October 24th, 2013

Sheldon's latest scientific breakthrough makes him feel like a fraud – and threatens to haunt him forever. Meanwhile, Howard's romantic gesture to Bernadette causes Penny to step up her game with Leonard.

The Big Bang Theory - The Proton Displacement - Season 7 Episode 7

7 | The Proton Displacement

Thursday, November 7th, 2013

Sheldon feels slighted when Professor Proton (recurring guest star Bob Newhart) seeks advice from Leonard instead of him, and he seeks revenge by befriending a rival science TV host, Bill Nye (guest starring as himself). Meanwhile, Raj gets jealous when Howard crashes "girls' night."

The Big Bang Theory - The Itchy Brain Simulation - Season 7 Episode 8

8 | The Itchy Brain Simulation

Thursday, November 14th, 2013

Leonard tries to keep Sheldon from overreacting when a past mistake comes to light, but Sheldon punishes Leonard by making him "walk a mile in his shoes." Meanwhile, Penny confronts Raj's ex-girlfriend, Lucy (guest star Kate Micucci).

The Big Bang Theory - The Thanksgiving Decoupling - Season 7 Episode 9

9 | The Thanksgiving Decoupling

Thursday, November 21st, 2013

An upset Sheldon protests when the entire gang drags him to Mrs. Wolowitz's house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.

The Big Bang Theory - The Discovery Dissipation - Season 7 Episode 10

10 | The Discovery Dissipation

Thursday, December 5th, 2013

Sheldon faces a crisis after Leonard disproves his accidental scientific discovery. Meanwhile, Raj must stay with Howard & Bernadette for a week.

The Big Bang Theory - The Cooper Extraction - Season 7 Episode 11

11 | The Cooper Extraction

Thursday, December 12th, 2013

While Sheldon is in Texas, the rest of the gang realize how much he has changed their lives as they decorate the apartment Christmas tree.

The Big Bang Theory - The Hesitation Ramification - Season 7 Episode 12

12 | The Hesitation Ramification

Thursday, January 2nd, 2014

As Leonard tries to help Penny with a disappointment, Penny asks him a bold question about their relationship; Sheldon wants to learn how to be funny.

The Big Bang Theory - The Occupation Recalibration - Season 7 Episode 13

13 | The Occupation Recalibration

Thursday, January 9th, 2014

Sheldon must learn how to relax when he is forced to take a vacation; Leonard tries to support Penny when she quits her job; Bernadette needs to replace one of Stuart's comic books.

The Big Bang Theory - The Convention Conundrum - Season 7 Episode 14

14 | The Convention Conundrum

Thursday, January 30th, 2014

Unable to get Comic-Con tickets, Sheldon tries to hold his own convention and ends up spending a wild evening with James Earl Jones; the ladies try to act maturely.

The Big Bang Theory - The Locomotive Manipulation - Season 7 Episode 15

15 | The Locomotive Manipulation

Thursday, February 6th, 2014

Sheldon and Amy go on a trip to wine country with Howard and Bernadette; Penny and Leonard rush Raj's dog to the vet

The Big Bang Theory - The Table Polarization - Season 7 Episode 16

16 | The Table Polarization

Thursday, February 27th, 2014

When Leonard buys a dining room table, Sheldon re-evaluates the changes in his life; Bernadette is torn when Wolowitz gets the chance to go back to space.

The Big Bang Theory - The Friendship Turbulence - Season 7 Episode 17

17 | The Friendship Turbulence

Thursday, March 6th, 2014

Bernadette tries to negotiate peace between Sheldon and Wolowitz; Penny receives an embarrassing offer; Raj wants Amy to write to a woman on his behalf.

The Big Bang Theory - The Mommy Observation - Season 7 Episode 18

18 | The Mommy Observation

Thursday, March 13th, 2014

Sheldon is faced with a new reality when he visits his mom in Houston; a murder mystery party starts arguments.

The Big Bang Theory - The Indecision Amalgamation - Season 7 Episode 19

19 | The Indecision Amalgamation

Thursday, April 3rd, 2014

Raj struggles with guilt when he dates two women at once; Penny has a chance to play a part in a cheesy movie; Sheldon is torn between two gaming systems.

The Big Bang Theory - The Relationship Diremption - Season 7 Episode 20

20 | The Relationship Diremption

Thursday, April 10th, 2014

Sheldon has a personal crisis when he decides string theory is a waste of his time; a double date ends in embarrassment for Howard.

The Big Bang Theory - The Anything Can Happen Recurrence - Season 7 Episode 21

21 | The Anything Can Happen Recurrence

Thursday, April 24th, 2014

Sheldon gives spontaneity a try, which causes unexpected friction for Penny, Bernadette and Amy; Raj asks Howard for help with preparation for a date with Emily.

The Big Bang Theory - The Proton Transmogrification - Season 7 Episode 22

22 | The Proton Transmogrification

Thursday, May 1st, 2014

Professor Proton helps Sheldon deal with grief; Leonard gets into a competition with Penny; Bernadette and Amy prepare a "Star Wars Day" gift for the guys.

The Big Bang Theory - The Gorilla Dissolution - Season 7 Episode 23

23 | The Gorilla Dissolution

Thursday, May 8th, 2014

A bad day compels Penny to re-evaluate her choices -- including Leonard; Bernadette and Howard must care for Mrs. Wolowitz; Sheldon gives Raj advice on relationships.

The Big Bang Theory - The Status Quo Combustion - Season 7 Episode 24

24 | The Status Quo Combustion

Thursday, May 15th, 2014

Faced with an uncertain future, Sheldon considers a major change; Emily and Raj decide to take things to the next level.

The Big Bang Theory - The Date Night Variable - Season 6 Episode 1

1 | The Date Night Variable

Thursday, September 27th, 2012

Raj faces his loneliness when his friends are out on dates; while in space, Wolowitz gets drawn into a fight between Bernadette and his mom.

The Big Bang Theory - The Decoupling Fluctuation - Season 6 Episode 2

2 | The Decoupling Fluctuation

Thursday, October 4th, 2012

Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard; Howard is picked on.

The Big Bang Theory - The Higgs Boson Observation - Season 6 Episode 3

3 | The Higgs Boson Observation

Thursday, October 11th, 2012

Amy feels threatened by Sheldon's new assistant; Wolowitz starts to feel the pressures of being in space.

The Big Bang Theory - The Re-Entry Minimization - Season 6 Episode 4

4 | The Re-Entry Minimization

Thursday, October 18th, 2012

Wolowitz's return from space isn't all he expected; game night becomes a gender war.

The Big Bang Theory - The Holographic Excitation - Season 6 Episode 5

5 | The Holographic Excitation

Thursday, October 25th, 2012

The gang heads to Stuart's comic book store to celebrate Halloween; Leonard uses science to seduce Penny.

The Big Bang Theory - The Extract Obliteration - Season 6 Episode 6

6 | The Extract Obliteration

Thursday, November 1st, 2012

A game threatens Sheldon's relationship with Stephen Hawking; Penny secretly signs up for a college class.

The Big Bang Theory - The Habitation Configuration - Season 6 Episode 7

7 | The Habitation Configuration

Thursday, November 8th, 2012

Bernadette wants Wolowitz to move out of his mom's house; Sheldon is caught in the middle of Amy and Wil Wheaton's argument.

The Big Bang Theory - The 43 Peculiarity - Season 6 Episode 8

8 | The 43 Peculiarity

Thursday, November 15th, 2012

Raj and Howard try to to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.

The Big Bang Theory - The Parking Spot Escalation - Season 6 Episode 9

9 | The Parking Spot Escalation

Thursday, November 29th, 2012

Sheldon and Wolowitz's fight over a parking spot at the university impacts the whole gang.

The Big Bang Theory - The Fish Guts Displacement - Season 6 Episode 10

10 | The Fish Guts Displacement

Thursday, December 6th, 2012

When Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.

The Big Bang Theory - The Santa Simulation - Season 6 Episode 11

11 | The Santa Simulation

Thursday, December 13th, 2012

During a game, Sheldon revisits Christmas memories; Amy, Penny and Bernadette look for a date for Koothrappali.

The Big Bang Theory - The Egg Salad Equivalency - Season 6 Episode 12

12 | The Egg Salad Equivalency

Thursday, January 3rd, 2013

When Sheldon is accused of sexual harassment, he ends up getting Raj, Leonard and Wolowitz in trouble.

The Big Bang Theory - The Bakersfield Expedition - Season 6 Episode 13

13 | The Bakersfield Expedition

Thursday, January 10th, 2013

As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.

The Big Bang Theory - The Cooper/Kripke Inversion - Season 6 Episode 14

14 | The Cooper/Kripke Inversion

Thursday, January 31st, 2013

Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.

The Big Bang Theory - The Spoiler Alert Segmentation - Season 6 Episode 15

15 | The Spoiler Alert Segmentation

Thursday, February 7th, 2013

A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.

The Big Bang Theory - The Tangible Affection Proof - Season 6 Episode 16

16 | The Tangible Affection Proof

Thursday, February 14th, 2013

The guys search for a perfect Valentine's Day gift for their significant others; Stuart and Raj host a "lonely people" party at the comic book store.

The Big Bang Theory - The Monster Isolation - Season 6 Episode 17

17 | The Monster Isolation

Thursday, February 21st, 2013

After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.

The Big Bang Theory - The Contractual Obligation Implementation - Season 6 Episode 18

18 | The Contractual Obligation Implementation

Thursday, March 7th, 2013

Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers; Raj plans a date with Lucy.

The Big Bang Theory - The Closet Reconfiguration - Season 6 Episode 19

19 | The Closet Reconfiguration

Thursday, March 14th, 2013

Howard considers whether or not he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.

The Big Bang Theory - The Tenure Turbulence - Season 6 Episode 20

20 | The Tenure Turbulence

Thursday, April 4th, 2013

The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.

The Big Bang Theory - The Closure Alternative - Season 6 Episode 21

21 | The Closure Alternative

Thursday, April 25th, 2013

Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.

The Big Bang Theory - The Proton Resurgence - Season 6 Episode 22

22 | The Proton Resurgence

Thursday, May 2nd, 2013

Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.

The Big Bang Theory - The Love Spell Potential - Season 6 Episode 23

23 | The Love Spell Potential

Thursday, May 9th, 2013

Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.

The Big Bang Theory - The Bon Voyage Reaction - Season 6 Episode 24

24 | The Bon Voyage Reaction

Thursday, May 16th, 2013

When Leonard is considered for an exciting research opportunity, Sheldon becomes jealous and tries to scare him into backing out. Meanwhile, Raj's relationship with Lucy is strained when he tries to get her to meet his friends.

The Big Bang Theory - The Skank Reflex Analysis - Season 5 Episode 1

1 | The Skank Reflex Analysis

Thursday, September 22nd, 2011

Penny is worried with how damaged her friendship with the guys will be in the aftermath of her sleeping with Raj while Sheldon becomes the leader of the paintball team.

The Big Bang Theory - The Infestation Hypothesis - Season 5 Episode 2

2 | The Infestation Hypothesis

Thursday, September 22nd, 2011

A fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.

The Big Bang Theory - The Pulled Groin Extrapolation - Season 5 Episode 3

3 | The Pulled Groin Extrapolation

Thursday, September 29th, 2011

Leonard and Amy get to know each other better, while Howard and Bernadette spend the weekend with Mrs. Wolowitz.

The Big Bang Theory - The Wiggly Finger Catalyst - Season 5 Episode 4

4 | The Wiggly Finger Catalyst

Thursday, October 6th, 2011

Penny plays Matchmaker for Raj, which results in him finding a girl he is comfortable talking to.

The Big Bang Theory - The Russian Rocket Reaction - Season 5 Episode 5

5 | The Russian Rocket Reaction

Thursday, October 13th, 2011

Sheldon and Leonard get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity.

The Big Bang Theory - The Rhinitis Revelation - Season 5 Episode 6

6 | The Rhinitis Revelation

Thursday, October 20th, 2011

Sheldon's mother, Mary Cooper, comes to visit, but Sheldon is annoyed that she also spends time with the rest of the gang, instead of catering to his every demand.

The Big Bang Theory - The Good Guy Fluctuation - Season 5 Episode 7

7 | The Good Guy Fluctuation

Thursday, October 27th, 2011

A cute comic book artist puts Leonard and Priya’s relationship to the test, while Sheldon tries to scare the guys for Halloween.

The Big Bang Theory - The Isolation Permutation - Season 5 Episode 8

8 | The Isolation Permutation

Thursday, November 3rd, 2011

Amy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress shopping without her.

The Big Bang Theory - The Ornithophobia Diffusion - Season 5 Episode 9

9 | The Ornithophobia Diffusion

Thursday, November 10th, 2011

Leonard and Penny try hanging out as friends on a 'non-date', but end up purposely ruining each others chances with perspective dates. Meanwhile, Sheldon enlists the help of Bernadette and Amy to overcome his fear of birds.

The Big Bang Theory - The Flaming Spittoon Acquisition - Season 5 Episode 10

10 | The Flaming Spittoon Acquisition

Thursday, November 17th, 2011

Sheldon considers taking his relationship with Amy to the next level when Stuart from the comic book store asks her out on a date.

The Big Bang Theory - The Speckerman Recurrence - Season 5 Episode 11

11 | The Speckerman Recurrence

Thursday, December 8th, 2011

Leonard must face his fears after being contacted by his high school tormentor.

The Big Bang Theory - The Shiny Trinket Maneuver - Season 5 Episode 12

12 | The Shiny Trinket Maneuver

Thursday, January 12th, 2012

Sheldon gets in trouble with Amy when he isn't impressed by her recent accomplishment, and Howard must come to grips with Bernadette's dislike of children.

The Big Bang Theory - The Recombination Hypothesis - Season 5 Episode 13

13 | The Recombination Hypothesis

Thursday, January 19th, 2012

Leonard, who broke up with Priya, asks Penny out to a spur-of the-moment romantic dinner for two, and the duo contemplates on their relationship.

The Big Bang Theory - The Beta Test Initiation - Season 5 Episode 14

14 | The Beta Test Initiation

Thursday, January 26th, 2012

Leonard and Penny deal with the idea of starting a relationship again and Raj finally finds a "woman" he can talk to without being drunk, in the form of Siri on his new phone. Meanwhile, Sheldon decides to start a YouTube series entitled "Sheldon Cooper presents Fun with Flags" with the help of Amy.

The Big Bang Theory - The Friendship Contraction - Season 5 Episode 15

15 | The Friendship Contraction

Thursday, February 2nd, 2012

Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.

The Big Bang Theory - The Vacation Solution - Season 5 Episode 16

16 | The Vacation Solution

Thursday, February 9th, 2012

When Sheldon is forced to take his vacation, he goes to work with Amy in her neurobiology lab.

The Big Bang Theory - The Rothman Disintegration - Season 5 Episode 17

17 | The Rothman Disintegration

Thursday, February 16th, 2012

Penny is horrified when Amy gives her a gift: a huge, quite horrible painting of the two of them. With no good way to avoid displaying it, she only hangs it up when Amy is over. When Amy catches her taking the painting down, she's embarrassed and angry until Penny lies and says the gift made Bernadette jealous. When the deranged Professor Rothman is forced to retire, both Sheldon and Kripke vie for his office. President Siebert refuses to resolve the dispute, so Leonard arranges a one-on-one basketball game to decide (since they're both equally bad at sports). Neither one can even make a single basket, so they end up deciding by seeing who can bounce the ball the highest. Sheldon wins; unfortunately, the office is not what he'd hoped for: the thermostat is located in the office of a professor going through the hot flashes of menopause (thus Sheldon is too cold), the mockingbird outside his window is off-key with the annoying windchimes, the perpetually naked Professor Rothman refuses to vacate, and the Geology Department upstairs makes too much noise. Finally, Sheldon gets his head stuck in the wall in an existing hole, after which Leonard takes his picture before he goes for help.

The Big Bang Theory - The Werewolf Transformation - Season 5 Episode 18

18 | The Werewolf Transformation

Thursday, February 23rd, 2012

Sheldon becomes agitated when his regular barber is out sick. Astronaut training causes Howard to reconsider wanting to go into space. Penny beats Leonard in chess, the first time she plays.

The Big Bang Theory - The Weekend Vortex - Season 5 Episode 19

19 | The Weekend Vortex

Thursday, March 8th, 2012

Sheldon must choose between joining Amy at her aunt's birthday party or playing videogames all weekend with the guys.

The Big Bang Theory - The Transporter Malfunction - Season 5 Episode 20

20 | The Transporter Malfunction

Thursday, March 29th, 2012

Penny buys Leonard and Sheldon “Star Trek” collectibles as a thank-you, leading Sheldon to be haunted by Mr. Spock. Meanwhile, Raj decides he has met the “Future Mrs. Koothrappali” after his parents set him up on a date.

The Big Bang Theory - The Hawking Excitation - Season 5 Episode 21

21 | The Hawking Excitation

Thursday, April 5th, 2012

When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.

The Big Bang Theory - The Stag Convergence - Season 5 Episode 22

22 | The Stag Convergence

Thursday, April 26th, 2012

After the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after learning about his sexual history.

The Big Bang Theory - The Launch Acceleration - Season 5 Episode 23

23 | The Launch Acceleration

Thursday, May 3rd, 2012

When NASA moves up Howard's mission, he must face his fears and Bernadette's dad, thus putting the wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.

The Big Bang Theory - The Countdown Reflection - Season 5 Episode 24

24 | The Countdown Reflection

Thursday, May 10th, 2012

The fifth season ends with Howard and Bernadette deciding to get married before his NASA mission, causing the gang to scurry into overdrive in an effort to stage the wedding. NASA astronaut Mike Massimino has a cameo as himself.

The Big Bang Theory - The Robotic Manipulation - Season 4 Episode 1

1 | The Robotic Manipulation

Thursday, September 23rd, 2010

Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.

The Big Bang Theory - The Cruciferous Vegetable Amplification - Season 4 Episode 2

2 | The Cruciferous Vegetable Amplification

Thursday, September 30th, 2010

Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.

The Big Bang Theory - The Zazzy Substitution - Season 4 Episode 3

3 | The Zazzy Substitution

Thursday, October 7th, 2010

The guys are concerned as Sheldon searches for an alternative to human companionship.

The Big Bang Theory - The Hot Troll Deviation - Season 4 Episode 4

4 | The Hot Troll Deviation

Thursday, October 14th, 2010

An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.

The Big Bang Theory - The Desperation Emanation - Season 4 Episode 5

5 | The Desperation Emanation

Thursday, October 21st, 2010

Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.

The Big Bang Theory - The Irish Pub Formulation - Season 4 Episode 6

6 | The Irish Pub Formulation

Thursday, October 28th, 2010

Leonard keeps an affair a secret from Sheldon, Howard and Raj.

The Big Bang Theory - The Apology Insufficiency - Season 4 Episode 7

7 | The Apology Insufficiency

Thursday, November 4th, 2010

Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.

The Big Bang Theory - The 21-Second Excitation - Season 4 Episode 8

8 | The 21-Second Excitation

Thursday, November 11th, 2010

While the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.

The Big Bang Theory - The Boyfriend Complexity - Season 4 Episode 9

9 | The Boyfriend Complexity

Thursday, November 18th, 2010

Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.

The Big Bang Theory - The Alien Parasite Hypothesis - Season 4 Episode 10

10 | The Alien Parasite Hypothesis

Thursday, December 9th, 2010

Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.

The Big Bang Theory - The Justice League Recombination - Season 4 Episode 11

11 | The Justice League Recombination

Thursday, December 16th, 2010

The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.

The Big Bang Theory - The Bus Pants Utilization - Season 4 Episode 12

12 | The Bus Pants Utilization

Thursday, January 6th, 2011

Leonard's idea for a smartphone app derails his friendship with Sheldon.

The Big Bang Theory - The Love Car Displacement - Season 4 Episode 13

13 | The Love Car Displacement

Thursday, January 20th, 2011

Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.

The Big Bang Theory - The Thespian Catalyst - Season 4 Episode 14

14 | The Thespian Catalyst

Thursday, February 3rd, 2011

Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.

The Big Bang Theory - The Benefactor Factor - Season 4 Episode 15

15 | The Benefactor Factor

Thursday, February 10th, 2011

A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.

The Big Bang Theory - The Cohabitation Formulation - Season 4 Episode 16

16 | The Cohabitation Formulation

Thursday, February 17th, 2011

As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.

The Big Bang Theory - The Toast Derivation - Season 4 Episode 17

17 | The Toast Derivation

Thursday, February 24th, 2011

Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.

The Big Bang Theory - The Prestidigitation Approximation - Season 4 Episode 18

18 | The Prestidigitation Approximation

Thursday, March 10th, 2011

Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.

The Big Bang Theory - The Zarnecki Incursion - Season 4 Episode 19

19 | The Zarnecki Incursion

Thursday, March 31st, 2011

Sheldon's World of Warcraft online game account is hacked and he is determined to find out who did it. Also Penny shares some girl talk with her friends about Leonard and his new girlfriend. When Howard discovers who hacked the account, the guys depart for a quest to Carlsbad, California where the hacker, Todd Zarnecki, lives in order to retrieve the stolen account, along with "enchanted weapons, gladiator armor, gold, and a battle ostrich, Glenn". Despite Sheldon carrying his Bat'leth with him they fail miserably. On the way back their car engine breaks down, and they're saved by Penny, who came to drive them home and upon hearing about their failure promises to show them "How we finish quests in Nebraska" and forces Zarnecki to give up kicking him below waist.

The Big Bang Theory - The Herb Garden Germination - Season 4 Episode 20

20 | The Herb Garden Germination

Thursday, April 7th, 2011

Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even higher level.

The Big Bang Theory - The Agreement Dissection - Season 4 Episode 21

21 | The Agreement Dissection

Thursday, April 28th, 2011

When Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate agreement. However, before he can get too far, Priya uses her skills as a lawyer to nullify the charges due to the agreement's vague wording, much to Sheldon's dismay. When the guys take advantage of Priya's skills in order to eat Greek food on pizza night, Sheldon goes to Penny, who invites him to a girls' night out with Amy and Bernadette, which Sheldon agrees to after Penny mentions that they may be talking trash about Priya. After the girls drink some cocktails, they decide to take Sheldon dancing, which Sheldon reluctantly goes along with. After dancing, Sheldon takes an intoxicated Amy back to her apartment and as well as talking about Priya, meets a monkey who is addicted to smoking cigarettes. Amy tells Sheldon not to give in to Priya's law skills, before kissing him and going to her bathroom to vomit.

The Big Bang Theory - The Wildebeest Implementation - Season 4 Episode 22

22 | The Wildebeest Implementation

Thursday, May 5th, 2011

Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.

The Big Bang Theory - The Engagement Reaction - Season 4 Episode 23

23 | The Engagement Reaction

Thursday, May 12th, 2011

When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.

The Big Bang Theory - The Roommate Transmogrification - Season 4 Episode 24

24 | The Roommate Transmogrification

Thursday, May 19th, 2011

When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.

The Big Bang Theory - The Electric Can Opener Fluctuation - Season 3 Episode 1

1 | The Electric Can Opener Fluctuation

Monday, September 21st, 2009

When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens Leonard's hope for some romantic time with Penny and the guys' friendship with Sheldon.

The Big Bang Theory - The Jiminy Conjecture - Season 3 Episode 2

2 | The Jiminy Conjecture

Monday, September 28th, 2009

Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake their best comic books on a bet to determine the species of a cricket.

The Big Bang Theory - The Gothowitz Deviation - Season 3 Episode 3

3 | The Gothowitz Deviation

Monday, October 5th, 2009

Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.

The Big Bang Theory - The Pirate Solution - Season 3 Episode 4

4 | The Pirate Solution

Monday, October 12th, 2009

Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as a third wheel.

The Big Bang Theory - The Creepy Candy Coating Corollary - Season 3 Episode 5

5 | The Creepy Candy Coating Corollary

Monday, October 19th, 2009

After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.

The Big Bang Theory - The Cornhusker Vortex - Season 3 Episode 6

6 | The Cornhusker Vortex

Monday, November 2nd, 2009

Sheldon becomes Leonard's teacher in order to understand football, while an incident with flying a kite threatens Howard and Raj's friendship.

The Big Bang Theory - The Guitarist Amplification - Season 3 Episode 7

7 | The Guitarist Amplification

Monday, November 9th, 2009

A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.

The Big Bang Theory - The Adhesive Duck Deficiency - Season 3 Episode 8

8 | The Adhesive Duck Deficiency

Monday, November 16th, 2009

With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.

The Big Bang Theory - The Vengeance Formulation - Season 3 Episode 9

9 | The Vengeance Formulation

Monday, November 23rd, 2009

After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.

The Big Bang Theory - The Gorilla Experiment - Season 3 Episode 10

10 | The Gorilla Experiment

Monday, December 7th, 2009

Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.

The Big Bang Theory - The Maternal Congruence - Season 3 Episode 11

11 | The Maternal Congruence

Monday, December 14th, 2009

A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny.

The Big Bang Theory - The Psychic Vortex - Season 3 Episode 12

12 | The Psychic Vortex

Monday, January 11th, 2010

Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university mixer.

The Big Bang Theory - The Bozeman Reaction - Season 3 Episode 13

13 | The Bozeman Reaction

Monday, January 18th, 2010

When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

The Big Bang Theory - The Einstein Approximation - Season 3 Episode 14

14 | The Einstein Approximation

Monday, February 1st, 2010

Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.

The Big Bang Theory - The Large Hadron Collision - Season 3 Episode 15

15 | The Large Hadron Collision

Monday, February 8th, 2010

Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.

The Big Bang Theory - The Excelsior Acquisition - Season 3 Episode 16

16 | The Excelsior Acquisition

Monday, March 1st, 2010

Sheldon winds up in traffic court when he gets a ticket because of Penny.

The Big Bang Theory - The Precious Fragmentation - Season 3 Episode 17

17 | The Precious Fragmentation

Monday, March 8th, 2010

When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.

The Big Bang Theory - The Pants Alternative - Season 3 Episode 18

18 | The Pants Alternative

Monday, March 22nd, 2010

Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.

The Big Bang Theory - The Wheaton Recurrence - Season 3 Episode 19

19 | The Wheaton Recurrence

Monday, April 12th, 2010

A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.

The Big Bang Theory - The Spaghetti Catalyst - Season 3 Episode 20

20 | The Spaghetti Catalyst

Monday, May 3rd, 2010

When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.

The Big Bang Theory - The Plimpton Stimulation - Season 3 Episode 21

21 | The Plimpton Stimulation

Monday, May 10th, 2010

Leonard and Sheldon compete for the attention of a famous female physicist.

The Big Bang Theory - The Staircase Implementation - Season 3 Episode 22

22 | The Staircase Implementation

Monday, May 17th, 2010

Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.

The Big Bang Theory - The Lunar Excitation - Season 3 Episode 23

23 | The Lunar Excitation

Monday, May 24th, 2010

While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.

The Big Bang Theory - The Bad Fish Paradigm - Season 2 Episode 1

1 | The Bad Fish Paradigm

Monday, September 22nd, 2008

Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

The Big Bang Theory - The Codpiece Topology - Season 2 Episode 2

2 | The Codpiece Topology

Monday, September 29th, 2008

A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.

The Big Bang Theory - The Barbarian Sublimation - Season 2 Episode 3

3 | The Barbarian Sublimation

Monday, October 6th, 2008

Sheldon creates a monster when he introduces Penny to online gaming.

The Big Bang Theory - The Griffin Equivalency - Season 2 Episode 4

4 | The Griffin Equivalency

Monday, October 13th, 2008

Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

The Big Bang Theory - The Euclid Alternative - Season 2 Episode 5

5 | The Euclid Alternative

Monday, October 20th, 2008

Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.

The Big Bang Theory - The Cooper-Nowitzki Theorem - Season 2 Episode 6

6 | The Cooper-Nowitzki Theorem

Monday, November 3rd, 2008

Sheldon and the gang are confused when a young grad student is attracted to him.

The Big Bang Theory - The Panty Piñata Polarization - Season 2 Episode 7

7 | The Panty Piñata Polarization

Monday, November 10th, 2008

When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.

The Big Bang Theory - The Lizard-Spock Expansion - Season 2 Episode 8

8 | The Lizard-Spock Expansion

Monday, November 17th, 2008

Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

The Big Bang Theory - The White Asparagus Triangulation - Season 2 Episode 9

9 | The White Asparagus Triangulation

Monday, November 24th, 2008

Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

The Big Bang Theory - The Vartabedian Conundrum - Season 2 Episode 10

10 | The Vartabedian Conundrum

Monday, December 8th, 2008

Leonard asks Penny for advice when his new relationship starts moving too fast.

The Big Bang Theory - The Bath Item Gift Hypothesis - Season 2 Episode 11

11 | The Bath Item Gift Hypothesis

Monday, December 15th, 2008

Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

The Big Bang Theory - The Killer Robot Instability - Season 2 Episode 12

12 | The Killer Robot Instability

Monday, January 12th, 2009

Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.

The Big Bang Theory - The Friendship Algorithm - Season 2 Episode 13

13 | The Friendship Algorithm

Monday, January 19th, 2009

Sheldon creates a scientific procedure for making friends.

The Big Bang Theory - The Financial Permeability - Season 2 Episode 14

14 | The Financial Permeability

Monday, February 2nd, 2009

Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.

The Big Bang Theory - The Maternal Capacitance - Season 2 Episode 15

15 | The Maternal Capacitance

Monday, February 9th, 2009

Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

The Big Bang Theory - The Cushion Saturation - Season 2 Episode 16

16 | The Cushion Saturation

Monday, March 2nd, 2009

A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.

The Big Bang Theory - The Terminator Decoupling - Season 2 Episode 17

17 | The Terminator Decoupling

Monday, March 9th, 2009

Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.

The Big Bang Theory - The Work Song Nanocluster - Season 2 Episode 18

18 | The Work Song Nanocluster

Monday, March 16th, 2009

Penny's home business turns into a complete nightmare when Sheldon takes over.

The Big Bang Theory - The Dead Hooker Juxtaposition - Season 2 Episode 19

19 | The Dead Hooker Juxtaposition

Monday, March 30th, 2009

Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."

The Big Bang Theory - The Hofstadter Isotope - Season 2 Episode 20

20 | The Hofstadter Isotope

Monday, April 13th, 2009

A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.

The Big Bang Theory - The Vegas Renormalization - Season 2 Episode 21

21 | The Vegas Renormalization

Monday, April 27th, 2009

Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.

The Big Bang Theory - The Classified Materials Turbulence - Season 2 Episode 22

22 | The Classified Materials Turbulence

Monday, May 4th, 2009

Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.

The Big Bang Theory - The Monopolar Expedition - Season 2 Episode 23

23 | The Monopolar Expedition

Monday, May 11th, 2009

The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.

The Big Bang Theory - Pilot - Season 1 Episode 1

1 | Pilot

Monday, September 24th, 2007

Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.

The Big Bang Theory - The Big Bran Hypothesis - Season 1 Episode 2

2 | The Big Bran Hypothesis

Monday, October 1st, 2007

Leonard volunteers to sign for a package in an attempt to make a good impression on Penny, but when he enlists Sheldon for help, his attempt at chivalry goes terribly awry.

The Big Bang Theory - The Fuzzy Boots Corollary - Season 1 Episode 3

3 | The Fuzzy Boots Corollary

Monday, October 8th, 2007

Leonard asks a woman out after he finds out that Penny is seeing someone.

The Big Bang Theory - The Luminous Fish Effect - Season 1 Episode 4

4 | The Luminous Fish Effect

Monday, October 15th, 2007

Sheldon's getting fired forces him to explore what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.

The Big Bang Theory - The Hamburger Postulate - Season 1 Episode 5

5 | The Hamburger Postulate

Monday, October 22nd, 2007

Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.

The Big Bang Theory - The Middle Earth Paradigm - Season 1 Episode 6

6 | The Middle Earth Paradigm

Monday, October 29th, 2007

Penny hosts a Hallowe'en party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.

The Big Bang Theory - The Dumpling Paradox - Season 1 Episode 7

7 | The Dumpling Paradox

Monday, November 5th, 2007

With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team

The Big Bang Theory - The Grasshopper Experiment - Season 1 Episode 8

8 | The Grasshopper Experiment

Monday, November 12th, 2007

Raj's parents set him up on a blind date, but just when he discovers he can talk to her, she shows interest in Sheldon.

The Big Bang Theory - The Cooper-Hofstadter Polarization - Season 1 Episode 9

9 | The Cooper-Hofstadter Polarization

Monday, March 17th, 2008

When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard, and Penny's intervention only exacerbates the situation.

The Big Bang Theory - The Loobenfeld Decay - Season 1 Episode 10

10 | The Loobenfeld Decay

Monday, March 24th, 2008

Leonard and Sheldon each lie to avoid seeing Penny's concert, but Sheldon's is a bit too complicated for his own good.

The Big Bang Theory - The Pancake Batter Anomaly - Season 1 Episode 11

11 | The Pancake Batter Anomaly

Monday, March 31st, 2008

With his friends knowing how sour he acts when sick—and avoiding him as a result—Sheldon is nursed by Penny, who hasn't a clue what she's in for.

The Big Bang Theory - The Jerusalem Duality - Season 1 Episode 12

12 | The Jerusalem Duality

Monday, April 14th, 2008

With Sheldon rattled over meeting Dennis, a 15-year-old physicist who's smarter than he, Leonard helps him look for a way to debunk Dennis's research.

The Big Bang Theory - The Bat Jar Conjecture - Season 1 Episode 13

13 | The Bat Jar Conjecture

Monday, April 21st, 2008

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team, hoping to prove he's superior.

The Big Bang Theory - The Nerdvana Annihilation - Season 1 Episode 14

14 | The Nerdvana Annihilation

Monday, April 28th, 2008

When delivery of another collectible leads to Penny's lashing out at Leonard, he decides it's time to give up his habit, much to his friends' protestation.

The Big Bang Theory - The Pork Chop Indeterminacy - Season 1 Episode 15

15 | The Pork Chop Indeterminacy

Monday, May 5th, 2008

The rest of the gang fall for Sheldon's twin sister, and Leonard's plan to win her heart is derailed when Sheldon declares he'll be the one to decide who can date her.

The Big Bang Theory - The Peanut Reaction - Season 1 Episode 16

16 | The Peanut Reaction

Monday, May 12th, 2008

Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.

The Big Bang Theory - The Tangerine Factor - Season 1 Episode 17

17 | The Tangerine Factor

Monday, May 19th, 2008

Penny's break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.


You need to log in or sign up to post a new review.

Mobile App for iPhone & iPad

iTV Shows Promo App

iTV Shows

Your series in series

iTV Shows Promo icon
Get the App now