Sheldon and Raj undertake an underground research expedition that turns into a test of how long before they get under each other's skin. Meanwhile, Leonard and Penny argue about money.
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Penny's flirtatious sales pitch leaves a doctor-client smitten and the guys must pitch in to help her deal with him, while, Bernadette and Amy debate whether female scientists ought to play the sexuality card.
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Amy and Bernadette organize a prom to be held atop the guys' apartment complex but Sheldon is leery of all the prom pomp, circumstance and romancing that goes with it.
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Leonard needs surgery for a deviated septum, and Sheldon gets his nose out of joint because he feels an operation is too dangerous and that his roommate may not make it out alive.
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It's a banner day for Sheldon as he bids a sad farewell to his Fun With Flags podcast. Meanwhile, Leonard, Howard and Raj probe a late professor's research in search of some hidden significance.
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On Christmas Eve, Amy plans a traditional Victorian dinner, while Raj, Leonard and Howard scramble to remove a pigeon that flew into the clean room at the university.
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Sheldon reverts back to 2003 when he learns that Leonard and Penny are moving in together. Meanwhile Howard and Raj form a band to play at the comic book store.
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When Barry Kripke gives the guys fencing lessons, he makes a point of letting Sheldon know he's interested in dating Amy. Stuart has trouble getting female customers at the Comic Book Store, so Penny, Amy and Bernadette stop by to help out.
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A helium shortage leads Sheldon and Leonard to do business with a dealer in the black market in order to acquire some of the element for an experiment they need to complete.
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Sheldon's interview for a "Star Trek" documentary focusing on Spock turns up a shocking revelation about his breakup with Amy. Meanwhile, the Wolowitzes haggle over the remodeling of his family home.
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When Leonard, Penny and Bernadette learn that Amy is going out on a dinner date, the trio set out to spy on her and the guy. Meanwhile, Sheldon recruits Raj and Howard to find a woman for him.
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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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Howard reconsiders entering into a legal partnership with Leonard and Sheldon regarding the patent for the infinite persistence gyroscope. Also, the women offer Raj dating advice after Emily reaches out to him following their breakup.
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Sheldon and Amy visit Leonard and Penny for the first time since the holidays and share details about their terrible trip to Texas.
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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.
