

(2010)
Season 4
2010
22m
Episode 10 - The Alien Parasite Hypothesis
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
Release Date
Dec 9, 2010

MAIN CAST

Johnny Galecki
Leonard Hofstadter

Jim Parsons
Sheldon Cooper

Kaley Cuoco
Penny

Simon Helberg
Howard Wolowitz
GUEST CAST

Brian Thomas Smith
Zack Johnson