• 84%
    818 votes
  • Rate this season
    What did you think?

The Big Bang Theory

Season 4 2010 - 2011

Hide ads with
  • 2010-09-24T00:00:00Z on CBS
  • 25 mins
  • 8 hours, 11 mins (24 episodes)
  • United States
  • English
  • Comedy
Hide ads with

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).

Hide ads with
Hide ads with

24 episodes

4x01 The Robotic Manipulation

  • Season Premiere

    2010-09-24T00:00:00Z — 21 mins

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

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

4x03 The Zazzy Substitution

  • 2010-10-08T00:00:00Z — 21 mins

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

4x04 The Hot Troll Deviation

  • 2010-10-15T00:00:00Z — 19 mins

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

4x05 The Desperation Emanation

  • 2010-10-22T00:00:00Z — 20 mins

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

4x06 The Irish Pub Formulation

  • 2010-10-29T00:00:00Z — 21 mins

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

4x07 The Apology Insufficiency

  • 2010-11-05T00:00:00Z — 21 mins

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

4x08 The 21-Second Excitation

  • 2010-11-12T01:00:00Z — 19 mins

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

4x09 The Boyfriend Complexity

  • 2010-11-19T01:00:00Z — 21 mins

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

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

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

4x12 The Bus Pants Utilization

  • 2011-01-07T01:00:00Z — 21 mins

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

4x13 The Love Car Displacement

  • 2011-01-21T01:00:00Z — 21 mins

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

4x14 The Thespian Catalyst

  • 2011-02-04T01:00:00Z — 21 mins

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

4x15 The Benefactor Factor

  • 2011-02-11T01:00:00Z — 20 mins

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

4x16 The Cohabitation Formulation

  • 2011-02-18T01:00:00Z — 20 mins

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

4x17 The Toast Derivation

  • 2011-02-25T01:00:00Z — 21 mins

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

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

4x19 The Zarnecki Incursion

  • 2011-04-01T00:00:00Z — 21 mins

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.

4x20 The Herb Garden Germination

  • 2011-04-08T00:00:00Z — 21 mins

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.

4x21 The Agreement Dissection

  • 2011-04-29T00:00:00Z — 20 mins

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.

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

4x23 The Engagement Reaction

  • 2011-05-13T00:00:00Z — 19 mins

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

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

Hide ads with
Hide ads with
Hide ads with
Hide ads with
Hide ads with
Hide ads with