The Big Bang Theory Season 4

Season 4

The Big Bang Theory Season 4

First Air Date: September 23, 2010

First Aired on    :   2010
Episodes    :   24 episodes

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).



Episodes

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4x24 The Roommate Transmogrification (May 19, 2011)


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


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4x23 The Engagement Reaction (May 12, 2011)


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


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4x22 The Wildebeest Implementation (May 05, 2011)


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


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4x21 The Agreement Dissection (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.


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4x20 The Herb Garden Germination (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.


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4x19 The Zarnecki Incursion (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.


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4x18 The Prestidigitation Approximation (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.


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4x17 The Toast Derivation (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.


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4x16 The Cohabitation Formulation (February 17, 2011)


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


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4x15 The Benefactor Factor (February 10, 2011)


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


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4x14 The Thespian Catalyst (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.


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4x13 The Love Car Displacement (January 20, 2011)


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


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4x12 The Bus Pants Utilization (January 06, 2011)


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


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4x11 The Justice League Recombination (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.


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4x10 The Alien Parasite Hypothesis (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.


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4x09 The Boyfriend Complexity (November 18, 2010)


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


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4x08 The 21-second Excitation (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.


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4x07 The Apology Insufficiency (November 04, 2010)


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


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4x06 The Irish Pub Formulation (October 28, 2010)


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


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4x05 The Desperation Emanation (October 21, 2010)


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


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4x04 The Hot Troll Deviation (October 14, 2010)


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


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4x03 The Zazzy Substitution (October 07, 2010)


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


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4x02 The Cruciferous Vegetable Amplification (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.


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4x01 The Robotic Manipulation (September 23, 2010)


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




Season Regulars