When 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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Leonard 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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Howard 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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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 a third wheel.

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After 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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Sheldon 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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A 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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With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.

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After 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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Penny 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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A 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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Leonard 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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When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

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Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.

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Leonard 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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Sheldon winds up in traffic court when he gets a ticket because of Penny.

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When 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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Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.

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A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.

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When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.

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Leonard and Sheldon compete for the attention of a famous female physicist.

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Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.

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While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.

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