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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S02E01 The Bad Fish Paradigm
September 22 · 22min find the promo
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Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
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S02E02 The Codpiece Topology
September 29 · 21min find the promo
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A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
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S02E03 The Barbarian Sublimation
October 6 · 21min find the promo
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Sheldon creates a monster when he introduces Penny to online gaming.
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S02E04 The Griffin Equivalency
October 13 · 21min find the promo
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Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
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S02E05 The Euclid Alternative
October 20 · 20min find the promo
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Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
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S02E06 The Cooper-Nowitzki Theorem
November 3 · 21min find the promo
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Sheldon and the gang are confused when a young grad student is attracted to him.
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S02E07 The Panty Piñata Polarization
November 10 · 21min find the promo
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When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
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S02E08 The Lizard-Spock Expansion
November 17 · 20min find the promo
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Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
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S02E09 The White Asparagus Triangulation
November 24 · 21min find the promo
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Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
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S02E10 The Vartabedian Conundrum
December 8 · 21min find the promo
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Leonard asks Penny for advice when his new relationship starts moving too fast.
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S02E11 The Bath Item Gift Hypothesis
December 15 · 21min find the promo
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Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
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S02E12 The Killer Robot Instability
January 12 · 21min find the promo
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Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.
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S02E13 The Friendship Algorithm
January 19 · 21min find the promo
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Sheldon creates a scientific procedure for making friends.
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S02E14 The Financial Permeability
February 2 · 21min find the promo
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Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
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S02E15 The Maternal Capacitance
February 9 · 21min find the promo
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Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
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S02E16 The Cushion Saturation
March 2 · 21min find the promo
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A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
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S02E17 The Terminator Decoupling
March 9 · 21min find the promo
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Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.
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S02E18 The Work Song Nanocluster
March 16 · 20min find the promo
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Penny's home business turns into a complete nightmare when Sheldon takes over.
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S02E19 The Dead Hooker Juxtaposition
March 30 · 20min find the promo
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Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
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S02E20 The Hofstadter Isotope
April 13 · 20min find the promo
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A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
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S02E21 The Vegas Renormalization
April 27 · 22min find the promo
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Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
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S02E22 The Classified Materials Turbulence
May 4 · 19min find the promo
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Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.
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S02E23 The Monopolar Expedition
May 11 · 21min find the promo
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The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.