We use cookies to improve your experience of our website. Cookies perform functions like recognising you each time you visit and delivering advertising messages that are relevant to you. Read more here

The Big Bang Theory

S4-E10 The Alien Parasite Hypothesis

S4-E10 The Alien Parasite Hypothesis

Watchlist
ADVERTISEMENT

Summary

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 & Crew

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
see more

Sitcom

Have Your Say What did you think of The Alien Parasite Hypothesis?

view all comments (0)