Sep. 24, 2007
30 min.
CBS TV Network

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The Big Bang Theory

Leonard and Sheldon are brilliant physicists, 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.

The Big Bang Theory Season 2 (2008-2009)

2x01 2 2x01 The Bad Fish Paradigm
Penny and Leonard go on a date, but when their night out goes awry, Penny finds a friend in Sheldon.
Sep. 22, 2008
2x02 2 2x02 The Codpiece Topology
Leonard begins dating Sheldon's nemesis, Leslie Winkle, after seeing Penny with a handsome new guy.
Sep. 29, 2008
2x03 2 2x03 The Barbarian Sublimination
Penny is introduced to online gaming by Sheldon, and she quickly becomes addicted.
Oct. 06, 2008
2x04 2 2x04 The Griffin Equivalency
Raj gets a swelled head and goes after Leonard's new crush, Penny, after being made famous in a magazine article leading to a disastrous result.
Oct. 13, 2008
2x05 2 2x05 The Euclid Alternative
Leonard and his friends want to help Sheldon overcome his fear of driving with an intervention.
Oct. 20, 2008
2x06 2 2x06 The Cooper-Nowitzki Theorem
Sheldon, as well as the others, are baffled when a young grad student begins to fall for him.
Nov. 03, 2008
2x07 2 2x07 The Panty Pinata Polarization
When Penny's cable gets cut, she starts coming over to the guys' apartment to watch America's Next Top Model. However, Sheldon bans her from the apartment for a series of petty infractions, ...
Nov. 10, 2008
2x08 2 2x08 The Lizard-Spock Expansion
Has a smitten Wolowitz found the love of his life, he thinks so until she meets Leonard.
Nov. 17, 2008
2x09 2 2x09 The White Asparagus Triangulation
Sheldon puts all his efforts to make Leonard's relationship with Stephanie, work.
Nov. 24, 2008
2x10 2 2x10 The Vartabedian Conundrum
Leonard ask for advice from Penny when his relationship with Stephanie begins moving too fast for him.
Dec. 08, 2008
2x11 2 2x11 The Bath Item Gift Hypothesis
Leonard finds no comfort and joy at Christmas time, as his colleague begins dating Penny. Meanwhile, Sheldon's adherence to gift-giving etiquette is driving everyone nuts.
Dec. 15, 2008
2x12 2 2x12 The Killer Robot Instability
Wolowitz leaves his friends in a bind when he drops out of an upcoming robot competition after becoming depressed when due to Penny's comment on his love life.
Jan. 12, 2009
2x13 2 2x13 The Friendship Algorithm
The boys discover a conundrum which is baffling: The very source of Sheldon's social awkwardness seems to be his intelligence, is also the reason according to his new scientific procedure ...
Jan. 19, 2009
2x14 2 2x14 The Financial Permeability
Penny receives help from Sheldon over her financial crisis, but causes Penny's burly ex-boyfriend, Kurt, to have a confrontation with Sheldon.
Feb. 02, 2009
2x15 2 2x15 The Maternal Capacitance
Penny and Leonard turn to each other and tequila for comfort after suffering a dreadful visit from his mother.
Feb. 09, 2009
2x16 2 2x16 The Cushion Saturation
A paintball game sparks a fight between Penny and Sheldon, and leads to romance for Wolowitz and Leslie.
Mar. 02, 2009
2x17 2 2x17 The Terminator Decoupling
Leonard, Sheldon, Wolowitz and Raj take a train trip to San Francisco and can hardly believe beautiful sci-fi actress Summer Glau is onboard.
Mar. 09, 2009
2x18 2 2x18 The Work Song Nanocluster
When Penny's friends, especially Sheldon, get involved in her new hair product business, it quickly suffers.
Mar. 16, 2009
2x19 2 2x19 The Dead Hooker Juxtaposition
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
Mar. 30, 2009
2x20 2 2x20 The Hofstadter Isotope
While at a comic book store, Penny is romanced by a friend of the guys'. Meanwhile, Leonard and Wolowitz head to a bar for ladies night in hope of finding women.
Apr. 13, 2009
2x21 2 2x21 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.
Apr. 27, 2009
2x22 2 2x22 The Classified Materials Turbulence
Penny makes an unexpected discovery concerning Leonard, while on a date with Stuart. Meanwhile, a design flaw in his NASA project finds Wolowitz needing some help from his friends. ...
May. 04, 2009
2x23 2 2x23 The Monopolar Expedition
Leonard packs his bags for a three-month long science trip, and he and Penny talk about their feelings for each other in the second-season finale.
May. 11, 2009
Season Guides

Season 2 Characters

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Season 2 Videos

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Season 2 Trivia

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