The Big Bang Theory

Episodes

Season 4 · 24 episodes

• E1 The Robotic Manipulation
  Sep 23, 2010 25 min

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

• E2 The Cruciferous Vegetable Amplification
  Sep 30, 2010 25 min

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

• E3 The Zazzy Substitution
  Oct 7, 2010 25 min

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

• E4 The Hot Troll Deviation
  Oct 14, 2010 25 min

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

• E5 The Desperation Emanation
  Oct 21, 2010 25 min

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

• E6 The Irish Pub Formulation
  Oct 28, 2010 25 min

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

• E7 The Apology Insufficiency
  Nov 4, 2010 25 min

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

• E8 The 21-Second Excitation
  Nov 11, 2010 25 min

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

• E9 The Boyfriend Complexity
  Nov 18, 2010 25 min

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

• E10 The Alien Parasite Hypothesis
  Dec 9, 2010 25 min

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

• E11 The Justice League Recombination
  Dec 16, 2010 25 min

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

• E12 The Bus Pants Utilization
  Jan 6, 2011 25 min

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

• E13 The Love Car Displacement
  Jan 20, 2011 25 min

  When the gang road trips to a conference, tensions run high when Bernadette runs into her ex-boyfriend.

• E14 The Thespian Catalyst
  Feb 3, 2011 25 min

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

• E15 The Benefactor Factor
  Feb 10, 2011 25 min

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

• E16 The Cohabitation Formulation
  Feb 17, 2011 25 min

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

• E17 The Toast Derivation
  Feb 24, 2011 25 min

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

• E18 The Prestidigitation Approximation
  Mar 10, 2011 25 min

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

• E19 The Zarnecki Incursion
  Mar 31, 2011 25 min

  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.

• E20 The Herb Garden Germination
  Apr 7, 2011 25 min

  Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to an even higher level.

• E21 The Agreement Dissection
  Apr 28, 2011 25 min

  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.

• E22 The Wildebeest Implementation
  May 5, 2011 25 min

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

• E23 The Engagement Reaction
  May 12, 2011 25 min

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

• E24 The Roommate Transmogrification
  May 19, 2011 25 min

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