“The Alien Parasite Hypothesis” — Amy finds she has sexual feelings for Penny’s ex, while Koothrappali (Kunal Nayyar, right) and Wolowitz (Simon Helberg, left) try to prove who would be the better superhero, on THE BIG BANG THEORY, Thursday, Dec. 9 (8:00-8:31 PM, ET/PT) on the CBS Television Network.
Photo: Monty Brinton/CBS
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