Last episode
The Stockholm Syndrome
s12e24 · 2019-05-17
Ended · US
The Big Bang Theory
CBS Scripted
What it is
The Big Bang Theory is a comedy about brilliant physicists, Leonard and Sheldon, who are the kind of "beautiful minds" that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door. Sheldon, Leonard's roommate, is quite content spending his nights playing Klingon Boggle with their socially dysfunctional friends, fellow Cal Tech scientists Wolowitz and Koothrappali. However, Leonard sees in Penny a whole new universe of possibilities... including love.
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Episode guide
23 this season · 279 totals02e01 The Bad Fish Paradigm 2008-09-23 00:00
The Bad Fish Paradigm
After her first date with Leonard goes awry, Penny finds an unwilling confidant in Leonard's anti-social roommate, Sheldon.
s02e02 The Codpiece Topology 2008-09-30 00:00
The Codpiece Topology
When Leonard sees Penny with a handsome new guy, he enters into a rebound relationship with Sheldon's nemesis, Leslie Winkle.
s02e03 The Barbarian Sublimation 2008-10-07 00:00
The Barbarian Sublimation
Sheldon creates a monster when he introduces Penny to the world of online gaming.
s02e04 The Griffin Equivalency 2008-10-14 00:00
The Griffin Equivalency
Raj, newly famous because of an article in a magazine, gets a big head and makes a disastrous play for Leonard's crush, Penny.
s02e05 The Euclid Alternative 2008-10-21 00:00
The Euclid Alternative
Leonard and his friends stage an intervention to make Sheldon confront his longstanding refusal to drive.
s02e06 The Cooper-Nowitzki Theorem 2008-11-04 01:00
The Cooper-Nowitzki Theorem
Young grad student's attraction to Sheldon confuses everyone, including Sheldon himself.
s02e07 The Panty Piñata Polarization 2008-11-11 01:00
The Panty Piñata Polarization
Penny vows to get revenge on Sheldon when he bans her from the apartment for a series of petty infractions.
s02e08 The Lizard-Spock Expansion 2008-11-18 01:00
The Lizard-Spock Expansion
Wolowitz thinks he's found the love of his life, until she meets Leonard.
s02e09 The White Asparagus Triangulation 2008-11-25 01:00
The White Asparagus Triangulation
Sheldon can barely contain his joy when Leonard starts dating a woman who meets Sheldon's exacting standards.
s02e10 The Vartabedian Conundrum 2008-12-09 01:00
The Vartabedian Conundrum
Sheldon uses Dr. Stephanie to check all his hypochondriac symptoms. When Leonard's relationship with a new woman starts moving too fast for him, he goes to Penny for advice.
s02e11 The Bath Item Gift Hypothesis 2008-12-16 01:00
The Bath Item Gift Hypothesis
Christmas is a source of stress for Leonard - whose handsome colleague starts dating Penny - and his friends, who are being tormented by Sheldon's obsession with gift-giving etiquette.
s02e12 The Killer Robot Instability 2009-01-13 01:00
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 team-mate in an upcoming fighting robot competition.
s02e13 The Friendship Algorithm 2009-01-20 01:00
The Friendship Algorithm
Socially awkward Sheldon develops a scientific procedure for making friends.
s02e14 The Financial Permeability 2009-02-03 01:00
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.
s02e15 The Maternal Capacitance 2009-02-10 02:30
The Maternal Capacitance
Disastrous visit from Mrs. Hofstadter brings Leonard and Penny closer together.
s02e16 The Cushion Saturation 2009-03-03 01:00
The Cushion Saturation
Paintball game leads to a fight between Penny and Sheldon, and romance for Wolowitz and Leslie.
s02e17 The Terminator Decoupling 2009-03-10 00:00
The Terminator Decoupling
Train trip to San Francisco takes a major detour when Sheldon discovers he forgot his flash drive and Leonard, Wolowitz and Raj discover that sci-fi actor Summer Glau is onboard.
s02e18 The Work Song Nanocluster 2009-03-17 00:00
The Work Song Nanocluster
Penny's home hair products business becomes a complete nightmare when a caffeine-addled Sheldon takes over.
s02e19 The Dead Hooker Juxtaposition 2009-03-31 00:00
The Dead Hooker Juxtaposition
Penny develops a rivalry with a sexy female neighbor who threatens to become 'The New Penny' in the building.
s02e20 The Hofstadter Isotope 2009-04-14 00:00
The Hofstadter Isotope
While 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.
s02e21 The Vegas Renormalization 2009-04-28 00:00
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.
s02e22 The Classified Materials Turbulence 2009-05-05 00:00
The Classified Materials Turbulence
Things begin to look up for Leonard when Penny makes a surprising revelation on her second date with Stuart. Meanwhile, Wolowitz enlists his friends' help when he discovers a critical design flaw in his project for NASA.
s02e23 The Monopolar Expedition 2009-05-12 00:00
The Monopolar Expedition
Penny is conflicted when Leonard and his friends decide to spend the summer working - at the North Pole.