“The Alien Parasite Hypothesis” — Amy Farrah Fowler (Mayim Bialik, left) tells Sheldon (Jim Parsons, right) that she has sexual feelings for Penny’s ex, while Koothrappali and Wolowitz 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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