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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S01E01 Pilot
September 24 · 23min find the promo
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Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.
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S01E02 The Big Bran Hypothesis
October 1 · 21min find the promo
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Leonard volunteers to sign for a package in an attempt to make a good impression on Penny, but when he enlists Sheldon for help, his attempt at chivalry goes terribly awry.
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S01E03 The Fuzzy Boots Corollary
October 8 · 22min find the promo
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Leonard asks a woman out after he finds out that Penny is seeing someone.
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S01E04 The Luminous Fish Effect
October 15 · 21min find the promo
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Sheldon's getting fired forces him to explore what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.
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S01E05 The Hamburger Postulate
October 22 · 20min find the promo
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Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.
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S01E06 The Middle-Earth Paradigm
October 29 · 21min find the promo
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Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.
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S01E07 The Dumpling Paradox
November 5 · 21min find the promo
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With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team
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S01E08 The Grasshopper Experiment
November 12 · 20min find the promo
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Raj's parents set him up on a blind date, but just when he discovers he can talk to her, she shows interest in Sheldon.
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S01E09 The Cooper-Hofstadter Polarization
March 17 · 19min find the promo
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When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard, and Penny's intervention only exacerbates the situation.
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S01E10 The Loobenfeld Decay
March 24 · 21min find the promo
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Leonard and Sheldon each lie to avoid seeing Penny's concert, but Sheldon's is a bit too complicated for his own good.
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S01E11 The Pancake Batter Anomaly
March 31 · 22min find the promo
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With his friends knowing how sour he acts when sick—and avoiding him as a result—Sheldon is nursed by Penny, who hasn't a clue what she's in for.
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S01E12 The Jerusalem Duality
April 14 · 20min find the promo
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With Sheldon rattled over meeting Dennis, a 15-year-old physicist who's smarter than he, Leonard helps him look for a way to debunk Dennis's research.
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S01E13 The Bat Jar Conjecture
April 21 · 22min find the promo
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Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team, hoping to prove he's superior.
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S01E14 The Nerdvana Annihilation
April 28 · 20min find the promo
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When delivery of another collectible leads to Penny's lashing out at Leonard, he decides it's time to give up his habit, much to his friends' protestation.
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S01E15 The Pork Chop Indeterminacy
May 5 · 22min find the promo
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The rest of the gang fall for Sheldon's twin sister, and Leonard's plan to win her heart is derailed when Sheldon declares he'll be the one to decide who can date her.
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S01E16 The Peanut Reaction
May 12 · 20min find the promo
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Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.
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S01E17 The Tangerine Factor
May 19 · 20min find the promo
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Penny's break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.