Episode List
Current Episode (aired May 16, 2013)
The Bon Voyage Reaction
In the Season 6 finale, Penny is thrown for a loop when Leonard is offered a job overseas, but the news is an even bigger shock to Sheldon. Raj wants more out of his relationship with Lucy than she can handle.
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Season 1
Sep. 24, 2007
Pilot
A pair of brilliant theoretical physicists meet a woman who shows them how little they know about the real world.
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Oct. 1, 2007
The Big Bran Hypothesis
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.
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Oct. 8, 2007
The Fuzzy Boots Corollary
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.
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Oct. 15, 2007
The Luminous Fish Effect
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.
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Oct. 22, 2007
The Hamburger Postulate
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.
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Oct. 29, 2007
The Middle Earth Paradigm
The guys are invited to Penny's Halloween costume party. During the party, Leonard has a run-in with Penny's ex-boyfriend.
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Nov. 5, 2007
The Dumpling Paradox
When Howard hooks up with Penny's old friend, it ruins the nights on which all of the guys play the game "Halo."
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Nov. 12, 2007
The Grasshopper Experiment
Rajesh'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.
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Mar. 17, 2008
The Cooper-Hofstadter Polarization
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.
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Mar. 24, 2008
The Loobenfeld Decay
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.
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Mar. 31, 2008
The Pancake Batter Anomaly
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.
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Apr. 14, 2008
The Jerusalem Duality
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.
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Apr. 21, 2008
The Bat Jar Conjecture
Sheldon becomes so intent on demonstrating his intellectual superiority over his Physics Bowl teammates that they boot him, and replace him with his nemesis.
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Apr. 28, 2008
The Nerdvana Annihilation
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.
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Airing Soon
May 5, 2008
The Pork Chop Indeterminacy
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.
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May 12, 2008
The Peanut Reaction
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.
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May 19, 2008
The Tangerine Factor
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.
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Season 1
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