The guys' competition for a tenured professorship leads them to shamelessly schmooze committee members, including an HR manager who's had a run-in with Sheldon.
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A letter written to the teenage Howard by his father, who had deserted the family years earlier, is uncovered in a closet, and the young man is unsure if he wants to read it. Meanwhile, Leonard and Penny host a cocktail party for grown-ups.
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Sheldon, Leonard and Howard promote careers in science before a group of junior-high girls, while Raj readies for a date with Lucy.
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Koothrappali is put out when his date walks out in the middle of their evening, so he vows that he will forever stay put in his apartment. Meanwhile, Sheldon is quite impressed when he witnesses Penny's acting skills firsthand.
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Leonard arranges a magical Valentine's Day dinner date for Penny, but the magic doesn't last after a squabbling Howard and Bernadette join them and Penny's ex turns up at the restaurant. Meanwhile, Sheldon assigns his research assistant to find a Valentine's Day present for Amy, while Raj talks Stuart into having a holiday party at the comic-book store.
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Leonard and Sheldon get into a spat that sends Leonard across the hall to live with Penny. Meanwhile, Raj keeps an eye on Mrs. Wolowitz while Howard's away on a trip.
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Sheldon is outraged, and his confidence takes a hit, when he's forced to work with his nemesis, Barry Kripke. Meanwhile, Howard and Raj shell out big bucks for action figures of themselves.
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The guys' road trip to a comic-book convention in Bakersfield, Cal., gets sidetracked when Leonard's car is stolen.
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Sheldon earns a date with the Employee Relations Department when he gets accused of sexual harassment, and it looks like Leonard, Raj and Howard may go down with him.
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A game of Dungeons & Dragons triggers Sheldon's memories of Christmases past, while Penny, Bernadette and Amy play matchmaker for Raj.
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Amy takes ill and Sheldon becomes her nursemaid, while Wolowitz takes a fishing trip in order to bond with his father-in-law.
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Sheldon gets all revved up when the university reassigns his parking space to returning space traveler Wolowitz, and the resulting battle affects the entire gang.
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Howard and Raj try to discover where Sheldon disappears to every afternoon at 2:45. Meanwhile, jealousy appears to have insinuated itself into Leonard and Penny's relationship.
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The new Mrs. Wolowitz wants her husband to move out of old Mrs. Wolowitz's house, while Amy and Wil Wheaton (as himself) get into a dispute, and Sheldon gets caught smack dab in the middle.
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A disagreement over a game of Words With Friends endangers Sheldon's relationship with his science idol Stephen Hawking, while Penny secretly takes a course at a local college.
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Leonard tries a scientific approach to seducing Penny, while the gang celebrates Halloween at Stuart's comic-book store. Former astronaut Buzz Aldrin has a cameo.
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Wolowitz is disappointed when he doesn't receive a hero's welcome upon his return from space, while game night degenerates into a pitched battle of the sexes.
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Amy feels threatened when Sheldon hires a young female assistant. Meanwhile, the pressure of being in space takes its toll on Wolowitz.
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Sheldon uncovers a secret about Penny and Leonard; and in space, the other astronauts are having a high time picking on Howard.
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Season 6 blasts off with Wolowitz in space, and despite that, he still has to intervene in an earthbound argument between his mother and Bernadette. Meanwhile, all Raj's friends are on dates, leaving him to ponder a solution to his loneliness.
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