The Alien Parasite Hypothesis

Dec 09, 2010 on CBS at 8:00 PM


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

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The Boyfriend Complexity
Season 4 Episode 9

Nov 18, 2010

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The Justice League Recombination
Season 4 Episode 11

Dec 16, 2010