The Big Bang Theory

The Alien Parasite Hypothesis

Season 4: Episode 10    | Next

Airs: Thursday, Dec 9 2010 at 11:11am on CBS TV TV-PG Comedy (Genre) Writer: Chuck Lorre, Bill Prady, Steve Molaro, Steve Holland, Jim Reynolds Composers:Gregory Sweeney

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Amy finds she has sexual feelings for Penny's ex-boyfriend Zack, while Raj and Howard try to prove who would be the better superhero.

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