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'Big Bang Theory': Leonard Revisits His Tortured Youth (Exclusive Video)

Sheldon helps his roommate figure out what an old high school nemesis could possibly want in an exclusive clip from Thursday's episode.

On tonight's Big Bang Theory, Leonard (Johnny Galecki) takes a stroll down unhappy memory lane when he's visited by his old high school bully, Jimmy (The Comeback's Lance Barber).

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In a clip exclusive to The Hollywood Reporter, Sheldon (Jim Parsons) attempts to help Leonard figure out just what Jimmy could possibly want -- by listing some of the ways in which he was tormented in high school as Penny (Kaley Cuoco) proposes a funny way in which the gang could spend New Year's Eve.

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The Big Bang Theory's "The Speckerman Recurrence" airs tonight at 8 p.m. and returns from its holiday hiatus on Jan. 12.

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