The Big Bang Theory - Season 4, Episode 10 - Rotten Tomatoes

The Alien Parasite Hypothesis


Episode Info

Amy finds she has sexual feelings for Penny's ex, Zack (guest star BRIAN THOMAS SMITH) while Koothrappali and Wolowitz try to prove who would be the better superhero.


Jim Parsons
as Sheldon
Simon Helberg
as Howard Wolowitz
Kunal Nayyar
as Rajesh Koothrappali
Melissa Rauch
as Bernadette
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The Alien Parasite Hypothesis Photos

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