The Big Bang Theory

  • The Roommate Transmogrification

    The Roommate Transmogrification Edit this episode

    Season 4, Episode 24 - Aired 05/19/2011

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

  • The Engagement Reaction

    The Engagement Reaction Edit this episode

    Season 4, Episode 23 - Aired 05/12/2011

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

  • The Wildebeest Implementation

    The Wildebeest Implementation Edit this episode

    Season 4, Episode 22 - Aired 05/05/2011

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

  • The Agreement Dissection

    The Agreement Dissection Edit this episode

    Season 4, Episode 21 - Aired 04/28/2011

    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.

  • The Herb Garden Germination

    The Herb Garden Germination Edit this episode

    Season 4, Episode 20 - Aired 04/07/2011

    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.

  • The Zarnecki Incursion

    The Zarnecki Incursion Edit this episode

    Season 4, Episode 19 - Aired 03/31/2011

    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 Prestidigitation Approximation

    The Prestidigitation Approximation Edit this episode

    Season 4, Episode 18 - Aired 03/10/2011

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

  • The Toast Derivation

    The Toast Derivation Edit this episode

    Season 4, Episode 17 - Aired 02/24/2011

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

  • The Cohabitation Formulation

    The Cohabitation Formulation Edit this episode

    Season 4, Episode 16 - Aired 02/17/2011

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

  • The Benefactor Factor

    The Benefactor Factor Edit this episode

    Season 4, Episode 15 - Aired 02/10/2011

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

  • The Thespian Catalyst

    The Thespian Catalyst Edit this episode

    Season 4, Episode 14 - Aired 02/03/2011

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

  • The Love Car Displacement

    The Love Car Displacement Edit this episode

    Season 4, Episode 13 - Aired 01/20/2011

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

  • The Bus Pants Utilization

    The Bus Pants Utilization Edit this episode

    Season 4, Episode 12 - Aired 01/06/2011

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

  • The Justice League Recombination

    The Justice League Recombination Edit this episode

    Season 4, Episode 11 - Aired 12/16/2010

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

  • The Alien Parasite Hypothesis

    The Alien Parasite Hypothesis Edit this episode

    Season 4, Episode 10 - Aired 12/09/2010

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

  • The Boyfriend Complexity

    The Boyfriend Complexity Edit this episode

    Season 4, Episode 9 - Aired 11/18/2010

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

  • The 21-Second Excitation

    The 21-Second Excitation Edit this episode

    Season 4, Episode 8 - Aired 11/11/2010

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

  • The Apology Insufficiency

    The Apology Insufficiency Edit this episode

    Season 4, Episode 7 - Aired 11/04/2010

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

  • The Irish Pub Formulation

    The Irish Pub Formulation Edit this episode

    Season 4, Episode 6 - Aired 10/28/2010

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

  • The Desperation Emanation

    The Desperation Emanation Edit this episode

    Season 4, Episode 5 - Aired 10/21/2010

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

  • The Hot Troll Deviation

    The Hot Troll Deviation Edit this episode

    Season 4, Episode 4 - Aired 10/14/2010

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

  • The Zazzy Substitution

    The Zazzy Substitution Edit this episode

    Season 4, Episode 3 - Aired 10/07/2010

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

  • The Cruciferous Vegetable Amplification

    The Cruciferous Vegetable Amplification Edit this episode

    Season 4, Episode 2 - Aired 09/30/2010

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

  • The Robotic Manipulation

    The Robotic Manipulation Edit this episode

    Season 4, Episode 1 - Aired 09/23/2010

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