The Big Bang Theory

Season 2

TV-PG

100%92%

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.

Where to Watch Season 2

23 Episodes

The Bad Fish Paradigm
E1
The Bad Fish ParadigmPenny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
The Codpiece Topology
E2
The Codpiece TopologyA jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
The Barbarian Sublimation
E3
The Barbarian SublimationSheldon creates a monster when he introduces Penny to online gaming.
The Griffin Equivalency
E4
The Griffin EquivalencyRaj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
The Euclid Alternative
E5
The Euclid AlternativeLeonard and his friends stage an intervention to force Sheldon to face his fear of driving.
The Cooper-Nowitzki Theorem
E6
The Cooper-Nowitzki TheoremSheldon and the gang are confused when a young grad student is attracted to him.
The Panty Piñata Polarization
E7
The Panty Piñata PolarizationWhen Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
The Lizard-Spock Expansion
E8
The Lizard-Spock ExpansionLeonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
The White Asparagus Triangulation
E9
The White Asparagus TriangulationSheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
The Vartabedian Conundrum
E10
The Vartabedian ConundrumLeonard asks Penny for advice when his new relationship starts moving too fast.
The Bath Item Gift Hypothesis
E11
The Bath Item Gift HypothesisPenny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
The Killer Robot Instability
E12
The Killer Robot InstabilityPenny'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.
The Friendship Algorithm
E13
The Friendship AlgorithmSheldon creates a scientific procedure for making friends.
The Financial Permeability
E14
The Financial PermeabilitySheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
The Maternal Capacitance
E15
The Maternal CapacitanceLeonard and Penny are drawn together after a disastrous visit from Leonard's mother.
The Cushion Saturation
E16
The Cushion SaturationA paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
The Terminator Decoupling
E17
The Terminator DecouplingLeonard, 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.
The Work Song Nanocluster
E18
The Work Song NanoclusterPenny's home business turns into a complete nightmare when Sheldon takes over.
The Dead Hooker Juxtaposition
E19
The Dead Hooker JuxtapositionPenny squares off with a new beautiful female neighbor who may become the building's "new Penny."
The Hofstadter Isotope
E20
The Hofstadter IsotopeA fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
The Vegas Renormalization
E21
The Vegas RenormalizationLeonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
The Classified Materials Turbulence
E22
The Classified Materials TurbulencePenny'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.
The Monopolar Expedition
E23
The Monopolar ExpeditionThe guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.