The Big Bang Theory Season 2 Episodes

Find out where to watch Season 2 of The Big Bang Theory tonight
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Season 2 Episode Guide

Episode 1 - The Bad Fish Paradigm

Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
Episode 2 - The Codpiece Topology

A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
Episode 3 - The Barbarian Sublimation

Sheldon creates a monster when he introduces Penny to online gaming.
Episode 4 - The Griffin Equivalency

Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
Episode 5 - The Euclid Alternative

Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
Episode 6 - The Cooper-Nowitzki Theorem

Sheldon and the gang are confused when a young grad student is attracted to him.
Episode 7 - The Panty Piñata Polarization

When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
Episode 8 - The Lizard-Spock Expansion

Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
Episode 9 - The White Asparagus Triangulation

Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
Episode 10 - The Vartabedian Conundrum

Leonard asks Penny for advice when his new relationship starts moving too fast.
Episode 11 - The Bath Item Gift Hypothesis

Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
Episode 12 - The Killer Robot Instability

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.
Episode 13 - The Friendship Algorithm

Sheldon creates a scientific procedure for making friends.
Episode 14 - The Financial Permeability

Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
Episode 15 - The Maternal Capacitance

Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
Episode 16 - The Cushion Saturation

A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
Episode 17 - The Terminator Decoupling

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.
Episode 18 - The Work Song Nanocluster

Penny's home business turns into a complete nightmare when Sheldon takes over.
Episode 19 - The Dead Hooker Juxtaposition

Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
Episode 20 - The Hofstadter Isotope

A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
Episode 21 - The Vegas Renormalization

Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
Episode 22 - The Classified Materials Turbulence

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.
Episode 23 - The Monopolar Expedition

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


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