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The Big Bang Theory season 4 episode 10

The Alien Parasite Hypothesis

Amy finds she has sexual feelings for Penny’s ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.

The Big Bang Theory: Season 4 Episode 10
The Big Bang Theory: Season 4 Episode 10
The Big Bang Theory: Season 4 Episode 10
The Big Bang Theory: Season 4 Episode 10
The Big Bang Theory: Season 4 Episode 10
The Big Bang Theory: Season 4 Episode 10
The Big Bang Theory: Season 4 Episode 10
The Big Bang Theory: Season 4 Episode 10
The Big Bang Theory: Season 4 Episode 10
The Big Bang Theory: Season 4 Episode 10
Dec. 09, 2010

The Big Bang Theory season 4