Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
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see all options Availability data: JustWatch
- Seasons
- 12
- Episodes aired
- 279
- Latest aired
- S12E23
- Total runtime
- 3d 22h
Timeline when each season aired
- Season 1 September 2007 – May 2008 17 episodes
- Season 2 September 2008 – May 2009 23 episodes
- Season 3 September 2009 – May 2010 23 episodes
- Season 4 September 2010 – May 2011 24 episodes
- Season 5 September 2011 – May 2012 24 episodes
- Season 6 September 2012 – May 2013 24 episodes
- Season 7 September 2013 – May 2014 24 episodes
- Season 8 September 2014 – May 2015 24 episodes
- Season 9 September 2015 – May 2016 24 episodes
- Season 10 September 2016 – May 2017 24 episodes
- Season 11 September 2017 – May 2018 24 episodes
- Season 12 September 2018 – May 2019 24 episodes
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S04E01 The Robotic Manipulation
September 23 · 21min find the promo
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Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
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S04E02 The Cruciferous Vegetable Amplification
September 30 · 21min find the promo
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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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S04E03 The Zazzy Substitution
October 7 · 21min find the promo
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The guys are concerned as Sheldon searches for an alternative to human companionship.
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S04E04 The Hot Troll Deviation
October 14 · 20min find the promo
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An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
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S04E05 The Desperation Emanation
October 21 · 21min find the promo
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Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
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S04E06 The Irish Pub Formulation
October 28 · 22min find the promo
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Leonard keeps an affair a secret from Sheldon, Howard and Raj.
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S04E07 The Apology Insufficiency
November 4 · 21min find the promo
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Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
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S04E08 The 21-Second Excitation
November 11 · 19min find the promo
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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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S04E09 The Boyfriend Complexity
November 18 · 21min find the promo
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Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
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S04E10 The Alien Parasite Hypothesis
December 9 · 20min find the promo
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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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S04E11 The Justice League Recombination
December 16 · 20min find the promo
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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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S04E12 The Bus Pants Utilization
January 6 · 21min find the promo
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Leonard's idea for a smartphone app derails his friendship with Sheldon.
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S04E13 The Love Car Displacement
January 20 · 21min find the promo
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Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
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S04E14 The Thespian Catalyst
February 3 · 21min find the promo
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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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S04E15 The Benefactor Factor
February 10 · 20min find the promo
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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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S04E16 The Cohabitation Formulation
February 17 · 20min find the promo
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As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
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S04E17 The Toast Derivation
February 24 · 21min find the promo
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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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S04E18 The Prestidigitation Approximation
March 10 · 21min find the promo
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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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S04E19 The Zarnecki Incursion
March 31 · 21min find the promo
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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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S04E20 The Herb Garden Germination
April 7 · 21min find the promo
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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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S04E21 The Agreement Dissection
April 28 · 21min find the promo
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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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S04E22 The Wildebeest Implementation
May 5 · 21min find the promo
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Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
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S04E23 The Engagement Reaction
May 12 · 20min find the promo
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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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S04E24 The Roommate Transmogrification
May 19 · 21min find the promo
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When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.