The Big Bang Theory
23 集
The Bad Fish Paradigm - 1
The Bad Fish Paradigm - 1
After her first date with Leonard (JOHNNY GALECKI) goes awry, Penny (KALEY CUOCO) finds an unwilling confidante in Leonard's anti-social roommate, Sheldon (JIM PARSONS).
The Codpiece Topology - 2
The Codpiece Topology - 2
When Leonard sees Penny with a handsome new guy (TRAVIS SCHULDT), he enters into a rebound relationship with Sheldon's nemesis, Leslie Winkle (series regular SARA GILBERT).
The Barbarian Sublimation - 3
The Barbarian Sublimation - 3
Sheldon creates a monster when he introduces Penny to the world of online gaming. Especially when her addiction wreaks havoc on his life.
The Griffin Equivalency - 4
The Griffin Equivalency - 4
Newly famous because of an article in a magazine, Raj (series regular KUNAL NAYYAR) gets an inflated ego and makes a disastrous play for Leonard's longtime crush, Penny.
The Euclid Alternative - 5
The Euclid Alternative - 5
Leonard and his friends stage an intervention to make Sheldon confront his longstanding fear of driving.
The Cooper-Nowitzki Theorem - 6
The Cooper-Nowitzki Theorem - 6
A young grad student's attraction to Sheldon confuses everyone -- including Sheldon himself.
The Panty Piñata Polarization - 7
The Panty Piñata Polarization - 7
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.
The Lizard-Spock Expansion - 8
The Lizard-Spock Expansion - 8
Wolowitz (series regular SIMON HELBERG) thinks he's found the love of his life (guest star SARA RUE) -- until she meets Leonard.
The White Asparagus Triangulation - 9
The White Asparagus Triangulation - 9
Sheldon can barely contain his joy when Leonard starts dating a woman (SARA RUE) who meets Sheldon's exacting standards.
The Vartabedian Conundrum - 10
The Vartabedian Conundrum - 10
Leonard just can't say no. When his relationship with new girlfriend, Stephanie starts moving too fast, Leonard turns to Penny for advice.
The Bath Item Gift Hypothesis - 11
The Bath Item Gift Hypothesis - 11
Leonard's handsome colleague starts dating Penny. And Leonard's friends are being tormented by Sheldon's obsession with gift-giving etiquette.
The Killer Robot Instability - 12
The Killer Robot Instability - 12
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.
The Friendship Algorithm - 13
The Friendship Algorithm - 13
Socially awkward Sheldon develops a scientific procedure for making friends.
The Financial Permeability - 14
The Financial Permeability - 14
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).
The Maternal Capacitance - 15
The Maternal Capacitance - 15
A disastrous visit from Mrs. Hofstadter (special guest star CHRISTINE BARANSKI) brings Leonard and Penny closer together.
The Cushion Saturation - 16
The Cushion Saturation - 16
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.
The Terminator Decoupling - 17
The Terminator Decoupling - 17
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.
The Work Song Nanocluster - 18
The Work Song Nanocluster - 18
Penny's home hair products business becomes a complete nightmare when a caffeine-addled Sheldon takes over.
The Dead Hooker Juxtaposition - 19
The Dead Hooker Juxtaposition - 19
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."
The Hofstadter Isotope - 20
The Hofstadter Isotope - 20
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".
The Vegas Renormalization - 21
The Vegas Renormalization - 21
Leonard and Koothrappali take a heartbroken Wolowitz to Las Vegas, leaving Sheldon locked out of his apartment and forced to bunk with Penny.
The Classified Materials Turbulence - 22
The Classified Materials Turbulence - 22
Penny makes a surprising revelation about Leonard on her second date with Stuart. And, Wolowitz enlists his friends' help when he discovers a design flaw in his NASA project.
The Monopolar Expedition - 23
The Monopolar Expedition - 23
In 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.
