The Big Bang Theory >> Season 4
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4x24 | The Roommate Transmogrification
May 20, 2011, 02:00AMWhen 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 13, 2011, 02:00AMWhen 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 06, 2011, 02:00AMRaj 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 29, 2011, 02:00AMWhen 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 08, 2011, 02:00AMSheldon 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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4x20 | The Herb Garden Germination
April 08, 2011, 02:00AMSheldon 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
April 01, 2011, 02:00AMSheldon'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.
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4x18 | The Prestidigitation Approximation
March 11, 2011, 02:00AMSheldon 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 25, 2011, 02:00AMSheldon 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 18, 2011, 02:00AMAs 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 11, 2011, 02:00AMA 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 04, 2011, 02:00AMHoping 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 21, 2011, 02:00AMBernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
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4x12 | The Bus Pants Utilization
January 07, 2011, 02:00AMLeonard's idea for a smartphone app derails his friendship with Sheldon.
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4x11 | The Justice League Recombination
December 17, 2010, 02:00AMThe 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 10, 2010, 02:00AMAmy 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 19, 2010, 02:00AMPenny 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 12, 2010, 02:00AMWhile 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 05, 2010, 01:00AMSheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
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4x06 | The Irish Pub Formulation
October 29, 2010, 02:00AMLeonard keeps an affair a secret from Sheldon, Howard and Raj.
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4x05 | The Desperation Emanation
October 22, 2010, 02:00AMLeonard 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 15, 2010, 02:00AMAn 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 08, 2010, 02:00AMThe guys are concerned as Sheldon searches for an alternative to human companionship.
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4x02 | The Cruciferous Vegetable Amplification
October 01, 2010, 02:00AMRealizing 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 24, 2010, 02:00AMPenny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.