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Looking to watch The Big Bang Theory Season 4 Episode 10 online? TV Fanatic is your destination for every paid and free streaming option of the The Big Bang Theory S4E10 full episode from 2 affiliates.

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Episode Details

The Big Bang Theory Season 4 Episode 10: "The Alien Parasite Hypothesis"

Amy realizes she has sexual feelings for Penny's ex on this episode. That's awkward. Meanwhile, Koothrappali and Wolowitz attempt to prove who would be the better superhero.