The Big Bang Theory

Series 4 - 10. The Alien Parasite Hypothesis

The Alien Parasite Hypothesis

About this programme

10/24. Amy finds she has romantic feelings for Penny's former boyfriend Zack, while Raj and Howard begin competing to prove which of them would make the better superhero. Comedy, guest starring Brian Thomas Smith.

Cast and crew

Cast

Leonard Hofstadter
Johnny Galecki
Sheldon Cooper
Jim Parsons
Penny
Kaley Cuoco
Howard Wolowitz
Simon Helberg
Raj Koothrappali
Kunal Nayyar
Amy Farrah Fowler
Mayim Bialik
Zack
Brian Thomas Smith
Categories
Sitcom

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