Title Airs On

S4:E1 The Robotic Manipulation

The Big Bang Theory
09/23/2010 11:04 am EDT

Penny ends up tagging along on Sheldon's first ever date with Amy, while Howard finds an unusual use for a robotic arm.

S4:E2 The Cruciferous Vegetable Amplification

The Big Bang Theory
09/30/2010 11:06 am EDT

When Sheldon calculates the technology to download his consciousness into a robot won't be invented soon enough, he ...read more When Sheldon calculates the technology to download his consciousness into a robot won't be invented soon enough, he desperately tries to find a way to increase his lifespan. show less

S4:E3 The Zazzy Substitution

The Big Bang Theory
10/07/2010 11:06 am EDT

Following his 'breakup' with Amy, the gang become concerned with Sheldon's obsessive search for non-human ...read more Following his 'breakup' with Amy, the gang become concerned with Sheldon's obsessive search for non-human companionship and call his mother to intervene. show less

S4:E4 The Hot Troll Deviation

The Big Bang Theory
10/14/2010 11:08 am EDT

Howard tries to get Penny's help in winning back Bernadette, but first has to confess the embarrassing reason why they broke ...read more Howard tries to get Penny's help in winning back Bernadette, but first has to confess the embarrassing reason why they broke up in the first place. Raj and Sheldon clash over a desk. show less

S4:E5 The Desperation Emanation

The Big Bang Theory
10/21/2010 11:09 am EDT

Sheldon is scared that he is in a relationship when Amy asks him to meet her mother, and Leonard asks Howard and Bernadette to ...read more Sheldon is scared that he is in a relationship when Amy asks him to meet her mother, and Leonard asks Howard and Bernadette to set him up because he is the only person in the group without a girlfriend. show less

S4:E6 The Irish Pub Formulation

The Big Bang Theory
10/28/2010 11:09 am EDT

Leonard tries to keep everyone from finding out that he spent the night with Raj's sister, but Sheldon finds out and ...read more Leonard tries to keep everyone from finding out that he spent the night with Raj's sister, but Sheldon finds out and concocts an elaborate story to help him keep the secret from Raj. show less

S4:E7 The Apology Insufficiency

The Big Bang Theory
11/04/2010 11:10 am EDT

An FBI agent interviews the guys when Howard needs to obtain a security clearance.

S4:E8 The 21-Second Excitation

The Big Bang Theory
11/11/2010 11:10 am EST

The guys camp out all night waiting to see an extended cut of Indiana Jones, while Amy joins in on girls' night with Penny ...read more The guys camp out all night waiting to see an extended cut of Indiana Jones, while Amy joins in on girls' night with Penny and Bernadette. show less

S4:E9 The Boyfriend Complexity

The Big Bang Theory
11/18/2010 11:11 am EST

Penny asks Leonard to pose as her boyfriend when her father visits. Howard, Raj and Bernadette have an awkward encounter when ...read more Penny asks Leonard to pose as her boyfriend when her father visits. Howard, Raj and Bernadette have an awkward encounter when they spend the evening together. show less

S4:E10 The Alien Parasite Hypothesis

The Big Bang Theory
12/09/2010 11:11 am EST

Amy finds she has sexual feelings for Penny's ex-boyfriend Zack, while Raj and Howard try to prove who would be the better ...read more Amy finds she has sexual feelings for Penny's ex-boyfriend Zack, while Raj and Howard try to prove who would be the better superhero. show less

S4:E11 The Justice League Recombination

The Big Bang Theory
12/16/2010 11:12 am EST

The guys enter a costume contest as members of the Justice League and convince Penny and Zack to join them.

S4:E12 The Bus Pants Utilization

The Big Bang Theory
01/06/2011 11:12 am EST

Leonard has an idea for a new smartphone app and asks the guys for help, however Sheldon tries to take over the project, and ...read more Leonard has an idea for a new smartphone app and asks the guys for help, however Sheldon tries to take over the project, and Leonard fires him. show less

S4:E13 The Love Car Displacement

The Big Bang Theory
01/20/2011 11:13 am EST

Chaos ensues when the gang spend the weekend together at a science convention.

S4:E14 The Thespian Catalyst

The Big Bang Theory
02/03/2011 11:13 am EST

To improve his skills as an instructor, Sheldon asks Penny to give him acting lessons. Meanwhile, Raj begins having impure ...read more To improve his skills as an instructor, Sheldon asks Penny to give him acting lessons. Meanwhile, Raj begins having impure fantasies about Bernadette. show less

S4:E15 The Benefactor Factor

The Big Bang Theory
02/10/2011 11:14 am EST

To secure needed funding for the university, Sheldon convinces Leonard to get friendly with a wealthy benefactor.

S4:E16 The Cohabitation Formulation

The Big Bang Theory
02/17/2011 11:14 am EST

Bernadette makes Howard choose between herself and his mother, while Penny and Raj become upset when Priya returns to town and ...read more Bernadette makes Howard choose between herself and his mother, while Penny and Raj become upset when Priya returns to town and resumes her relationship with Leonard. show less

S4:E17 The Toast Derivation

The Big Bang Theory
02/24/2011 11:15 am EST

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

S4:E18 The Prestidigitation Approximation

The Big Bang Theory
03/10/2011 11:16 am EST

Priya forces Leonard to choose between a relationship with her or a friendship with Penny. A magic trick by Howard has Sheldon ...read more Priya forces Leonard to choose between a relationship with her or a friendship with Penny. A magic trick by Howard has Sheldon fooled. show less

S4:E19 The Zarnecki Incursion

The Big Bang Theory
03/31/2011 11:16 am EDT

The guys go all out to help Sheldon find the person responsible for hacking his online gaming account, while the girls' ...read more The guys go all out to help Sheldon find the person responsible for hacking his online gaming account, while the girls' hatred for Priya increases. show less

S4:E20 The Herb Garden Germination

The Big Bang Theory
04/07/2011 11:17 am EDT

Sheldon and Amy secretly experiment on the gang by spreading rumors when they hear that Bernadette is thinking about breaking up ...read more Sheldon and Amy secretly experiment on the gang by spreading rumors when they hear that Bernadette is thinking about breaking up with Howard. show less

S4:E21 The Agreement Dissection

The Big Bang Theory
04/28/2011 11:17 am EDT

When Priya finds a loophole in the roommate agreement to throw Sheldon out for the night, Penny, Amy and Bernadette take him to ...read more When Priya finds a loophole in the roommate agreement to throw Sheldon out for the night, Penny, Amy and Bernadette take him to a nightclub. show less

S4:E22 The Wildebeest Implementation

The Big Bang Theory
05/05/2011 11:18 am EDT

Sheldon invents a three-player chess game, Penny and Amy use Bernadette to spy on Leonard and Priya, and Raj tries a new drug to ...read more Sheldon invents a three-player chess game, Penny and Amy use Bernadette to spy on Leonard and Priya, and Raj tries a new drug to treat his social anxiety. show less

S4:E23 The Engagement Reaction

The Big Bang Theory
05/12/2011 11:19 am EDT

Howard believes that his mom suffered a heart attack because he told her that he's marrying Bernadette, Sheldon freaks out ...read more Howard believes that his mom suffered a heart attack because he told her that he's marrying Bernadette, Sheldon freaks out over germs, and Penny and Priya bond. show less

S4:E24 The Roommate Transmogrification

The Big Bang Theory
05/19/2011 11:19 am EDT

Raj moves in with Sheldon after hearing Leonard and Priya engage in a Star Trek fantasy in his apartment. Bernadette receives ...read more Raj moves in with Sheldon after hearing Leonard and Priya engage in a Star Trek fantasy in his apartment. Bernadette receives her doctorate. show less