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The Big Bang Theory Season 4

September. 23,2010
| Comedy
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This season the Big Bang gang’s romantic universe expands. On the rebound from Penny, Leonard falls into the arms of Raj’s sister Priya. Sheldon gets a girlfriend, or rather a friend who is a girl: Amy, a dour neurobiologist who declares herself besties with Penny. Howard and Bernadette heat up. And so do Raj and Bernadette (at least in Raj’s Bollywood daydream).


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The Big Bang Theory Season 4 Full Episode Guide

Episode 24 - The Roommate Transmogrification
First Aired: May. 19,2011

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

Episode 23 - The Engagement Reaction
First Aired: May. 12,2011

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

Episode 22 - The Wildebeest Implementation
First Aired: May. 05,2011

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

Episode 21 - The Agreement Dissection
First Aired: April. 28,2011

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.

Episode 20 - The Herb Garden Germination
First Aired: April. 07,2011

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.

Episode 19 - The Zarnecki Incursion
First Aired: March. 31,2011

Sheldon's online-game account is hacked by Todd Zarnecki, who then proceeds to steal all his items prompting the guys to go on a quest to retrieve them. Penny, Bernadette and Amy discuss how Penny groomed Leonard to be willing to try various things and more adventurous boyfriend... for some other woman — Priya.

Episode 18 - The Prestidigitation Approximation
First Aired: March. 10,2011

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

Episode 17 - The Toast Derivation
First Aired: February. 24,2011

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

Episode 16 - The Cohabitation Formulation
First Aired: February. 17,2011

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

Episode 15 - The Benefactor Factor
First Aired: February. 10,2011

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

Episode 14 - The Thespian Catalyst
First Aired: February. 03,2011

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

Episode 13 - The Love Car Displacement
First Aired: January. 20,2011

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

Episode 12 - The Bus Pants Utilization
First Aired: January. 06,2011

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

Episode 11 - The Justice League Recombination
First Aired: December. 16,2010

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

Episode 10 - The Alien Parasite Hypothesis
First Aired: December. 09,2010

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

Episode 9 - The Boyfriend Complexity
First Aired: November. 18,2010

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

Episode 8 - The 21-second Excitation
First Aired: November. 11,2010

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

Episode 7 - The Apology Insufficiency
First Aired: November. 04,2010

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

Episode 6 - The Irish Pub Formulation
First Aired: October. 28,2010

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

Episode 5 - The Desperation Emanation
First Aired: October. 21,2010

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

Episode 4 - The Hot Troll Deviation
First Aired: October. 14,2010

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

Episode 3 - The Zazzy Substitution
First Aired: October. 07,2010

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

Episode 2 - The Cruciferous Vegetable Amplification
First Aired: September. 30,2010

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

Episode 1 - The Robotic Manipulation
First Aired: September. 23,2010

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

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