Leonard and Sheldon each lie to avoid hearing Penny sing in a production of Rent. However, Sheldon's lie becomes a bit too complicated for its own good.
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With his friends knowing how sour he acts when sick and avoiding him as a result, Sheldon is nursed for by Penny, who hasn't a clue what she's in for.
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With Sheldon rattled and impossible to be around after meeting Dennis, a 15-year-old physicist who's smarter than he, the rest of the guys search for a way to eliminate the threat.
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An electrical short thaws the last meal that was cooked by Mrs. Wolowitz, and the gang ponders what to do with it, while Sheldon and Leonard's work is featured in a magazine, but only one receives credit.
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Now just friends, Sheldon and Amy spend Thanksgiving at the aquarium; a reluctant Wolowitz volunteers at a soup kitchen with Bernadette, Raj and Emily; and Penny realizes that Leonard knows a bit more about her than he's let on.
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After a marital disagreement, Penny takes off for a spa weekend with Amy, and Sheldon steps in to play peacemaker for the squabbling newlyweds. Meanwhile, Howard and Raj do battle with a noisy floor in the baby's room.
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Sheldon learns about an MIT invention that can help read people's emotions. Leonard has trouble hiding his emotions when Penny announces her brother is going to visit; and Raj gathers former girlfriends to ask for their dating advice.
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With Sheldon hindering progress on the guidance-system project, Leonard and Stuart figure the only way they can get back on track is to engineer a distraction by getting him tickets to a historic railroad.
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Amy is incensed when she discovers Sheldon has shared intimate relationship information with people at the University; and Raj is knocked for a loop when his father stops sending financial support.
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Without financial backing from his father, Raj finds himself in a cash crunch and turns to Sheldon to help him get his head above water. Meanwhile, Penny considers crashing the guys' annual Comic-Con getaway.
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Sheldon and Howard plan birthday celebrations for Amy and Halley, respectively. Leonard receives a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.
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To discover who would be most qualified to be best man and maid of honor at their wedding, Sheldon and Amy subject their friends to a series of secret experiments. Also, Penny reveals her true feelings about Amy.
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When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Bert replaces Howard in the band Footprints on the Moon, and Sheldon finds Penny a surprising source of scientific inspiration.
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Raj learns the woman he's dating has a very upset husband. Sheldon rents his old room for a quiet place to work.
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About
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.
