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The Big Bang Theory S4E10 poster

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

The Big Bang Theory • Season 4, Episode 10 • 20 min • 2007 • ⭐ 7.9/10 • Comedy

Cast: Jim Parsons , Kaley Cuoco , Johnny Galecki , Simon Helberg , Kunal Nayyar , Melissa Rauch , Mayim Bialik

Directors: Chuck Lorre , Bill Prady

Watch The Big Bang Theory – S4E10

Episode Overview

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

Episode Navigation

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