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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S03E01 The Electric Can Opener Fluctuation
September 21 · 22min find the promo
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When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens Leonard's hope for some romantic time with Penny and the guys' friendship with Sheldon.
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S03E02 The Jiminy Conjecture
September 28 · 21min find the promo
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Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake their best comic books on a bet to determine the species of a cricket.
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S03E03 The Gothowitz Deviation
October 5 · 20min find the promo
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Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.
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S03E04 The Pirate Solution
October 12 · 21min find the promo
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Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as a third wheel.
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S03E05 The Creepy Candy Coating Corollary
October 19 · 21min find the promo
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After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.
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S03E06 The Cornhusker Vortex
November 2 · 20min find the promo
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Sheldon becomes Leonard's teacher in order to understand football, while an incident with flying a kite threatens Howard and Raj's friendship.
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S03E07 The Guitarist Amplification
November 9 · 19min find the promo
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A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.
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S03E08 The Adhesive Duck Deficiency
November 16 · 21min find the promo
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With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
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S03E09 The Vengeance Formulation
November 23 · 19min find the promo
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After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.
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S03E10 The Gorilla Experiment
December 7 · 21min find the promo
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Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.
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S03E11 The Maternal Congruence
December 14 · 20min find the promo
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A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny.
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S03E12 The Psychic Vortex
January 11 · 19min find the promo
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Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university mixer.
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S03E13 The Bozeman Reaction
January 18 · 20min find the promo
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When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
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S03E14 The Einstein Approximation
February 1 · 19min find the promo
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Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
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S03E15 The Large Hadron Collision
February 8 · 21min find the promo
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Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.
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S03E16 The Excelsior Acquisition
March 1 · 21min find the promo
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Sheldon winds up in traffic court when he gets a ticket because of Penny.
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S03E17 The Precious Fragmentation
March 8 · 20min find the promo
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When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.
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S03E18 The Pants Alternative
March 22 · 21min find the promo
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Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
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S03E19 The Wheaton Recurrence
April 12 · 21min find the promo
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A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.
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S03E20 The Spaghetti Catalyst
May 3 · 20min find the promo
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When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
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S03E21 The Plimpton Stimulation
May 10 · 21min find the promo
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Leonard and Sheldon compete for the attention of a famous female physicist.
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S03E22 The Staircase Implementation
May 17 · 20min find the promo
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Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
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S03E23 The Lunar Excitation
May 24 · 20min find the promo
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While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.