"The Big Bang Theory"
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Episodes: All (48)  |  With full-length videos ()  |  With videos ()  | See all videos (99) »

Season: 1  |  2  |  3
Year: 2007  |  2008  |  2009

Season 1

"The Big Bang Theory" (2007): Season 1: Episode 1 -- The Insider's Lara Spencer goes behind the scenes with the cast of The Big Bang Theory
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Season 1, Episode 1: Pilot

Original Air Date—24 September 2007
A pair of brilliant theoretical physicists meet a woman who shows them how little they know about the real world.

Season 1, Episode 2: The Big Bran Hypothesis

Original Air Date—1 October 2007
Penny is furious and more than a little freaked out with Leonard and Sheldon when they sneak into her apartment overnight, and clean it while she is sleeping.

Season 1, Episode 3: The Fuzzy Boots Corollary

Original Air Date—8 October 2007
Leonard gets upset when he discovers that Penny is seeing a new guy, so he tries to trick her into going on a date with him.
"The Big Bang Theory" (2007): Season 1: Episode 4 -- Raj, newly famous because of an article in a magazine, gets a big head and makes a disastrous play for Leonard's crush, Penny, on THE BIG BANG THEORY

Season 1, Episode 4: The Luminous Fish Effect

Original Air Date—15 October 2007
Sheldon's Christian-fundamentalist mother visits to get him out of the funk he's in after he is fired for being disrespectful toward his new boss.

Season 1, Episode 5: The Hamburger Postulate

Original Air Date—22 October 2007
Leonard and his colleague Leslie spend the night together. But Leslie tells Leonard after the fact that she's only interested in a one-night stand.

Season 1, Episode 6: The Middle Earth Paradigm

Original Air Date—29 October 2007
The guys are invited to Penny's Halloween costume party. During the party, Leonard has a run-in with Penny's ex-boyfriend.
"The Big Bang Theory" (2007): Season 1: Episode 7 -- America's Next Top Model meets Big Bang Theory, on CBS!
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Season 1, Episode 7: The Dumpling Paradox

Original Air Date—5 November 2007
When Howard hooks up with Penny's old friend, it ruins the nights on which all of the guys play the game "Halo."
"The Big Bang Theory" (2007): Season 1: Episode 8 -- The guys on the Big Bang Theory have an interesting way of settling their disputes...
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Season 1, Episode 8: The Grasshopper Experiment

Original Air Date—12 November 2007
Rajnesh's parents, communicating from India by Web cam, arrange for him to go out with another Indian woman in the hopes of marriage, but his date turns out to have more in common with Sheldon.

Season 1, Episode 9: The Cooper-Hofstadter Polarization

Original Air Date—17 March 2008
Leonard and Sheldon's friendship is put to the test when Leonard wants to present a paper they co-authored at a physics convention, but Sheldon does not.

Season 1, Episode 10: The Loobenfeld Decay

Original Air Date—24 March 2008
Leonard lies to Penny so that he and Sheldon can get out of watching her perform. However, Sheldon believes that the lie has too many loose ends, so he comes up with a new, unnecessarily complex one to replace it.

Season 1, Episode 11: The Pancake Batter Anomaly

Original Air Date—31 March 2008
Sheldon is sick, and Leonard and the guys sneak out to a "Planet of the Apes" movie marathon to get out of taking care of him--which leaves Penny as the only person to whom the needy Sheldon can turn.
"The Big Bang Theory" (2007): Season 1: Episode 12 -- The boys quote a classic line from a Star Trek movie in order to convice Sheldon to compete in an academic competition

Season 1, Episode 12: The Jerusalem Duality

Original Air Date—14 April 2008
Sheldon is threatened when a new 15-year-old prodigy who is smarter than him joins the lab, so the guys come up with a plan to get rid of him.
"The Big Bang Theory" (2007): Season 1: Episode 13 -- When Leonard buys a time machine online that he can't afford the boys decide to go in on it together

Season 1, Episode 13: The Bat Jar Conjecture

Original Air Date—21 April 2008
Sheldon becomes so intent on demonstrating his intellectual superiority over his Physics Bowl teammates that they boot him, and replace him with his nemesis.

Season 1, Episode 14: The Nerdvana Annihilation

Original Air Date—28 April 2008
Penny gets mad at Leonard because the guys' new "time machine" causes her to miss work. Leonard is so devastated that he vows to give up all of his nerd memorabilia.

Season 1, Episode 15: The Pork Chop Indeterminacy

Original Air Date—5 May 2008
Sheldon's sexy twin sister arrives in town from Texas, and all of Sheldon's friends fight over who will get to be with her.

Season 1, Episode 16: The Peanut Reaction

Original Air Date—12 May 2008
When Penny and the guys learn that Leonard has never had a birthday party, they decide to try to throw a surprise party for him.

Season 1, Episode 17: The Tangerine Factor

Original Air Date—19 May 2008
After Penny breaks up with her new guy, she agrees to go out on a date with Leonard. However, both of them have reservations about the date soon after agreeing to it.

Season 2

"The Big Bang Theory" (2007): Season 2: Episode 1 -- Check out the illustrated version of The Big Bang Theory theme song, sung by the Barenaked Ladies! Catch the season premiere on September 22nd, only on CBS!
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Season 2, Episode 1: The Bad Fish Paradigm

Original Air Date—22 September 2008
Leonard is concerned when his date with Penny ends abruptly and she starts blowing him off. When told the truth, Sheldon would rather move out than keep Penny's reasons a secret from Leonard.
"The Big Bang Theory" (2007): Season 2: Episode 2 -- Lenard's opinion of Loop Quantum Gravity becomes a dealbreaker for Leslie (Sara Gilbert).

Season 2, Episode 2: The Codpiece Topology

Original Air Date—29 September 2008
After seeing Penny with her new boyfriend, Leonard turns to Leslie for comfort. The move angers Sheldon, who considers Leslie his comic book-style "arch enemy."

Season 2, Episode 3: The Barbarian Sublimation

Original Air Date—6 October 2008
Sheldon turns Penny on to online gaming, and then she refuses to turn it off after becoming addicted.

Season 2, Episode 4: The Griffin Equivalency

Original Air Date—13 October 2008
After being featured in a People magazine article, Raj becomes full of himself and alienates his friends. However, his newfound fame does get him a date with Penny.
"The Big Bang Theory" (2007): Season 2: Episode 5 -- The gang creates a simulater to help Sheldon get over his longstanding fear of driving.
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Season 2, Episode 5: The Euclid Alternative

Original Air Date—20 October 2008
The gang tries to teach Sheldon how to drive.

Season 2, Episode 6: The Cooper-Nowitzki Theorem

Original Air Date—3 November 2008
Sheldon becomes cozy with a female graduate student who is infatuated with him, but nobody can figure out whether they're in a relationship--including Sheldon.
"The Big Bang Theory" (2007): Season 2: Episode 7 -- Leonard shares his plans to move in with Stephanie.

Season 2, Episode 7: The Panty Piñata Polarization

Original Air Date—10 November 2008
Penny plans revenge when Sheldon bans her from the guys' apartment, while Howard and Rajesh use the latest technology to try to find the house being used in "America's Next Top Model."

Season 2, Episode 8: The Lizard-Spock Expansion

Original Air Date—17 November 2008
Howard and Leonard's friendship could be at an end when Leonard steals Howard's new woman from him.

Season 2, Episode 9: The White Asparagus Triangulation

Original Air Date—24 November 2008
Sheldon tries to help move Leonard's new relationship along, because his track record with women has been less than successful. But will he cause more trouble than good?
"The Big Bang Theory" (2007): Season 2: Episode 10 -- Penny and Stephanie (Sara Rue) have an awkward introductoin.
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Season 2, Episode 10: The Vartabedian Conundrum

Original Air Date—8 December 2008
Leonard is the last one to realize that Stephanie has moved in with him. And when he finds out, he becomes worried that they are moving too fast
"The Big Bang Theory" (2007): Season 2: Episode 11 -- Sheldon has solved the "Penny gift Dilemma."
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Season 2, Episode 11: The Bath Item Gift Hypothesis

Original Air Date—15 December 2008
Much to Lenonard's disappointment, Penny suddenly develops an interest in science when a sexy new physicist joins the lab. Meanwhile, Sheldon struggles to find an appropriate Christmas gift for Penny.

Season 2, Episode 12: The Killer Robot Instability

Original Air Date—12 January 2009
Howard becomes depressed after Penny makes a cruel statement about his love life, while the rest of the guys prepare for a grudge killer robot duel against an obnoxious colleague at the university.

Season 2, Episode 13: The Friendship Algorithm

Original Air Date—19 January 2009
Sheldon tries to make friends with a despised colleague, with the hopes that it will get him access to a coveted computer in the lab.

Season 2, Episode 14: The Financial Permeability

Original Air Date—2 February 2009
Penny cannot afford to pay her rent, so Sheldon and Leonard each come up with unique ways to help her out.

Season 2, Episode 15: The Maternal Capacitance

Original Air Date—9 February 2009
Sheldon hits it off with Leonard's psychoanalyst mother, but she drives Leonard and Penny to the bottle.

Season 2, Episode 16: The Cushion Saturation

Original Air Date—5 May 2009
Howard hooks up with Leslie, while Penny accidentally ruins Sheldon's spot on the couch.

Season 2, Episode 17: The Terminator Decoupling

Original Air Date—9 March 2009
On a train trip to San Francisco, the boys debate on how to meet sci-fi star Summer Glau, who is on board with them.
"The Big Bang Theory" (2007): Season 2: Episode 18 -- Are you tired of all those boring old games? Well today you're in luck! Get a Secret Agent Laser Obstacle Kit to liven up any ordinary game to be super awesome! Watch 'The Big Bang Theory' for more brilliant ways to liven up your mundane Mondays!
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Season 2, Episode 18: The Work Song Nanocluster

Original Air Date—16 March 2009
Sheldon's assistance with Penny's home-based business leads to disaster.
"The Big Bang Theory" (2007): Season 2: Episode 19 -- Penny is threatened when there's a new girl in the building.

Season 2, Episode 19: The Dead Hooker Juxtaposition

Original Air Date—30 March 2009
Penny becomes jealous when a gorgeous new neighbor attracts the guys' attention.
"The Big Bang Theory" (2007): Season 2: Episode 20 -- An inside look at science in The Big Bang Theory.
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Season 2, Episode 20: The Hofstadter Isotope

Original Air Date—13 April 2009
Leonard is so upset when a friend from the comic book store begins dating Penny that he convinces Howard and Raj to take him to a bar so that he can pick up a woman of his own.

Season 2, Episode 21: The Vegas Renormalization

Original Air Date—27 April 2009
After being dumped by Leslie, Howard heads to Las Vegas with Leonard and Raj, leaving Penny to deal with Sheldon, who has locked himself out of the apartment.

Season 2, Episode 22: The Classified Materials Turbulence

Original Air Date—4 May 2009
Penny's second date with Stuart has significant implications for Leonard. Howard enlists the guys' help with one of his NASA projects.

Season 2, Episode 23: The Monopolar Expedition

Original Air Date—11 May 2009
Penny gets upset when she finds out Leonard and the guys plan to work at the North Pole for the summer.

Season 3

Season 3, Episode 1: The Electric Can Opener Fluctuation

Original Air Date—21 September 2009
After returning from the North Pole, a conflict among the guys sends Sheldon back to Texas and interferes with Leonard's reunion with Penny.

Season 3, Episode 2: The Jiminy Conjecture

Original Air Date—28 September 2009
Leonard and Penny's first night together goes awkwardly. Sheldon and Howard wager on the species of a cricket.

Season 3, Episode 3: The Gothowitz Deviation

Original Air Date—5 October 2009
Sheldon attempts to covertly alter Penny's habits, while Howard and Raj try their luck meeting women at a Goth-style club.

Season 3, Episode 4: The Pirate Solution

Original Air Date—12 October 2009
Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as third wheel.

Season 3, Episode 5: The Creepy Candy Coating Corollary

Original Air Date—19 October 2009
Wolowitz begs Penny to set him up with one of her friends; Sheldon seeks payback against Wil Wheaton at a trading-card show.

Season 3, Episode 6: The Cornhusker Vortex

Original Air Date—2 November 2009
To blend in better with several of Penny's friends from back home, Leonard learns about football...from Sheldon. Meanwhile, a loss in a kite war threatens to end Raj and Howard's friendship.

Season 3, Episode 7: The Guitarist Amplification

Original Air Date—9 November 2009
Sheldon is forced to play peacemaker when Leonard and Penny have an argument.

Season 3, Episode 8: The Adhesive Duck Deficiency

Original Air Date—16 November 2009
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
Next US airings:
Mon. Nov. 169:31 PMCBS

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