The Big Bang Theory Season 2 Episodes

Find out where to watch Season 2 of The Big Bang Theory tonight
Overview TV Listings Seasons & Episodes Cast

Season 2 Episode Guide

Episode 1 - The Bad Fish Paradigm

In the second season premiere, after her first date with Leonard goes awry, Penny finds an unwilling confidant in Leonard's anti-social roommate, Sheldon.
Episode 2 - The Codpiece Topology

Penny and Leonard compete to see who will be the first to move on after their breakup. When Leonard sees Penny with a handsome new guy (guest star TRAVIS SCHULDT -- Scrubs), he enters into a rebound relationship with Sheldon's nemesis, Leslie Winkle (series regular SARA GILBERT).
Episode 3 - The Barbarian Sublimination

Sheldon creates a monster when he introduces Penny to the world of online gaming. Especially when her addiction wreaks havoc on his life.
Episode 4 - The Griffin Equivalency

Raj's ego puts all of his friendships in jeopardy when he gets an inflated sense of self. Newly famous because of an article in a magazine, Raj (series regular KUNAL NAYYAR) makes a disastrous play for Leonard's longtime crush, Penny.
Episode 5 - The Euclid Alternative

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

A young grad students attraction to Sheldon confuses everyone including Sheldon himself.
Episode 7 - The Panty Pinata Polarization

Sheldon and Penny engage in a battle of wills as Penny vows to get revenge on Sheldon when he bans her from the apartment for a series of petty infractions.
Episode 8 - The Lizard-Spock Expansion

Wolowitz (series regular SIMON HELBERG) thinks he's found the love of his life (guest star SARA RUE) until she meets Leonard.
Episode 9 - The White Asparagus Triangulation

Sheldon can barely contain his joy when Leonard starts dating a woman (Sara Rue) who meets Sheldon's exacting standards.
Episode 10 - The Vartabedian Conundrum

Leonard just can't say no. When his relationship with new girlfriend, Stephanie starts moving too fast, Leonard turns to Penny for advice.
Episode 11 - The Bath Item Gift Hypothesis

Leonard's handsome colleague starts dating Penny. And Leonard's friends are being tormented by Sheldon's obsession with gift-giving etiquette.
Episode 12 - The Killer Robot Instability

When Penny's comment about Wolowitz's love life sends him into a depressed stupor, his friends lose their most important teammate in an upcoming fighting robot competition.
Episode 13 - The Friendship Algorithm

Socially awkward Sheldon develops a scientific procedure for making friends.
Episode 14 - The Financial Permeability

Sheldon's "simple" solution to Penny's financial problem leads to a confrontation between Leonard and Penny's hulking ex-boyfriend, Kurt (guest star Brian Patrick Wade).
Episode 15 - The Maternal Capacitance

A disastrous visit from Mrs. Hofstadter (special guest star Christine Baranski) brings Leonard and Penny closer together.
Episode 16 - The Cushion Saturation

A paintball game has surprising consequences for Leonard and his friends when it leads to a fight between Penny and Sheldon and romance for Wolowitz and Leslie.
Episode 17 - The Terminator Decoupling

A train trip to San Francisco takes a major detour when Leonard, Sheldon, Wolowitz and Raj discover that beautiful sci-fi actress Summer Glau ("Terminator") is onboard.
Episode 18 - The Work Song Nanocluster

Penny's home hair products business becomes a complete nightmare when a caffeine-addled Sheldon takes over.
Episode 19 - The Dead Hooker Juxtaposition

There's a new queen bee in the building! Penny develops a rivalry with a sexy female neighbor moves in to the building and threatens to become the "new Penny".
Episode 20 - The Hofstadter Isotope

While Stuart (guest star Kevin Sussman), a fellow comic book-loving pal of the guys, romances Penny, Leonard and Wolowitz venture out into the world of "Ladies' Night" at a local bar.
Episode 21 - The Vegas Renormalization

Leonard and Koothrappali take a heartbroken Wolowitz to Las Vegas, leaving Sheldon locked out of his apartment and forced to bunk with Penny.
Episode 22 - The Classified Materials Turbulence

Things begin to look up for Leonard when Penny makes a surprising revelation on her second date with Stuart (guest star Kevin Sussman). Meanwhile, Wolowitz enlists his friends' help when he discovers a critical design flaw in his project for NASA.
Episode 23 - The Monopolar Expedition

On the second season finale, Leonard and Penny reconsider their feelings for one another. When Leonard and his friends decide to spend the summer working at the North Pole Penny is conflicted.


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