The Big Bang Theory (2007)
Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
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Episode 1 - The Electric Can Opener Fluctuation
Release Date: 2009-09-21When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens Leonard's hope for some romantic time with Penny and the guys' friendship with Sheldon.
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Episode 2 - The Jiminy Conjecture
Release Date: 2009-09-28Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake their best comic books on a bet to determine the species of a cricket.
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Episode 3 - The Gothowitz Deviation
Release Date: 2009-10-05Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.
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Episode 4 - The Pirate Solution
Release Date: 2009-10-12Raj 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 a third wheel.
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Episode 5 - The Creepy Candy Coating Corollary
Release Date: 2009-10-19After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.
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Episode 6 - The Cornhusker Vortex
Release Date: 2009-11-02Sheldon becomes Leonard's teacher in order to understand football, while an incident with flying a kite threatens Howard and Raj's friendship.
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Episode 7 - The Guitarist Amplification
Release Date: 2009-11-09A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.
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Episode 8 - The Adhesive Duck Deficiency
Release Date: 2009-11-16With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
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Episode 9 - The Vengeance Formulation
Release Date: 2009-11-23After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.
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Episode 10 - The Gorilla Experiment
Release Date: 2009-12-07Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.
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Episode 11 - The Maternal Congruence
Release Date: 2009-12-14A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny.
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Episode 12 - The Psychic Vortex
Release Date: 2010-01-11Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university mixer.
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Episode 13 - The Bozeman Reaction
Release Date: 2010-01-18When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
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Episode 14 - The Einstein Approximation
Release Date: 2010-02-01Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
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Episode 15 - The Large Hadron Collision
Release Date: 2010-02-08Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.
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Episode 16 - The Excelsior Acquisition
Release Date: 2010-03-01Sheldon winds up in traffic court when he gets a ticket because of Penny.
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Episode 17 - The Precious Fragmentation
Release Date: 2010-03-08When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.
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Episode 18 - The Pants Alternative
Release Date: 2010-03-22Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
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Episode 19 - The Wheaton Recurrence
Release Date: 2010-04-12A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.
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Episode 20 - The Spaghetti Catalyst
Release Date: 2010-05-03When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
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Episode 21 - The Plimpton Stimulation
Release Date: 2010-05-10Leonard and Sheldon compete for the attention of a famous female physicist.
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Episode 22 - The Staircase Implementation
Release Date: 2010-05-17Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
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Episode 23 - The Lunar Excitation
Release Date: 2010-05-24While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.