Season 2
23 episodes · Sep 22, 2008
This season, Leonard gets a girl. So does Sheldon. Howard drives the Mars Rover into a ditch. Raj woos a terminator. Gorgeous girl-next-door Penny falls under the spell of Age of Conan. And super-smart, ueberconfident Leslie Winkler reduces mere men to spineless jellyfish.
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S2E1The Bad Fish Paradigm
Sep 22, 200822mPenny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
S2E2The Codpiece Topology
Sep 29, 200821mA jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
S2E3The Barbarian Sublimation
Oct 6, 200821mSheldon creates a monster when he introduces Penny to online gaming.
S2E4The Griffin Equivalency
Oct 13, 200821mRaj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
S2E5The Euclid Alternative
Oct 20, 200820mLeonard and his friends stage an intervention to force Sheldon to face his fear of driving.
S2E6The Cooper-Nowitzki Theorem
Nov 3, 200821mSheldon and the gang are confused when a young grad student is attracted to him.
S2E7The Panty Piñata Polarization
Nov 10, 200821mWhen Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
S2E8The Lizard-Spock Expansion
Nov 17, 200820mLeonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
S2E9The White Asparagus Triangulation
Nov 24, 200821mSheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
S2E10The Vartabedian Conundrum
Dec 8, 200821mLeonard asks Penny for advice when his new relationship starts moving too fast.
S2E11The Bath Item Gift Hypothesis
Dec 15, 200821mPenny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
S2E12The Killer Robot Instability
Jan 12, 200921mPenny'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.
S2E13The Friendship Algorithm
Jan 19, 200921mSheldon creates a scientific procedure for making friends.
S2E14The Financial Permeability
Feb 2, 200921mSheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
S2E15The Maternal Capacitance
Feb 9, 200921mLeonard and Penny are drawn together after a disastrous visit from Leonard's mother.
S2E16The Cushion Saturation
Mar 2, 200921mA paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
S2E17The Terminator Decoupling
Mar 9, 200921mLeonard, 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.
S2E18The Work Song Nanocluster
Mar 16, 200920mPenny's home business turns into a complete nightmare when Sheldon takes over.
S2E19The Dead Hooker Juxtaposition
Mar 30, 200920mPenny squares off with a new beautiful female neighbor who may become the building's "new Penny."
S2E20The Hofstadter Isotope
Apr 13, 200920mA fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
S2E21The Vegas Renormalization
Apr 27, 200922mLeonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
S2E22The Classified Materials Turbulence
May 4, 200919mPenny'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.
S2E23The Monopolar Expedition
May 11, 200921mThe guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.