The Big Bang Theory

Episodes

Season 2 · 23 episodes

• E1 The Bad Fish Paradigm
  Sep 22, 2008 25 min

  Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

• E2 The Codpiece Topology
  Sep 29, 2008 25 min

  A jealous Leonard reacts to Penny's new guy by rebounding with Leslie Winkle.

• E3 The Barbarian Sublimation
  Oct 6, 2008 25 min

  Sheldon creates a monster when he introduces Penny to online gaming. Meanwhile, Sheldon disagrees with Leslie Winkle at work.

• E4 The Griffin Equivalency
  Oct 13, 2008 25 min

  Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

• E5 The Euclid Alternative
  Oct 20, 2008 25 min

  Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.

• E6 The Cooper-Nowitzki Theorem
  Nov 3, 2008 25 min

  Sheldon and the gang are confused when a young grad student is attracted to him.

• E7 The Panty Piñata Polarization
  Nov 10, 2008 25 min

  When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate. Meanwhile, Howard and Rajesh try to find the house where all the models from "America's Top Model" are staying.

• E8 The Lizard-Spock Expansion
  Nov 17, 2008 25 min

  Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

• E9 The White Asparagus Triangulation
  Nov 24, 2008 25 min

  Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

• E10 The Vartabedian Conundrum
  Dec 8, 2008 25 min

  Leonard asks Penny for advice when his new relationship starts moving too fast.

• E11 The Bath Item Gift Hypothesis
  Dec 15, 2008 25 min

  Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

• E12 The Killer Robot Instability
  Jan 12, 2009 25 min

  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.

• E13 The Friendship Algorithm
  Jan 19, 2009 25 min

  Sheldon creates a scientific procedure for making friends.

• E14 The Financial Permeability
  Feb 2, 2009 25 min

  Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.

• E15 The Maternal Capacitance
  Feb 9, 2009 25 min

  Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

• E16 The Cushion Saturation
  Mar 2, 2009 25 min

  A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.

• E17 The Terminator Decoupling
  Mar 9, 2009 25 min

  Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress is on board the train they are taking to San Francisco.

• E18 The Work Song Nanocluster
  Mar 16, 2009 25 min

  Penny's home business turns into a complete nightmare when Sheldon takes over.

• E19 The Dead Hooker Juxtaposition
  Mar 30, 2009 25 min

  Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."

• E20 The Hofstadter Isotope
  Apr 13, 2009 25 min

  When a fellow comic book enthusiast hits on Penny it leads to Leonard and Howard going to a bar's on Ladies' Night.

• E21 The Vegas Renormalization
  Apr 27, 2009 25 min

  Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.

• E22 The Classified Materials Turbulence
  May 4, 2009 25 min

  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.

• E23 The Monopolar Expedition
  May 11, 2009 25 min

  The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.