The Big Bang Theory The Alien Parasite Hypothesis (Season 4, Episode 10)
TV-PG
TV Episode | 20 min | Comedy, Romance

Primary photo for The Alien Parasite Hypothesis

The Big Bang Theory

The Alien Parasite Hypothesis (Season 4, Episode 10)

TV-PG

TV Episode | 20 min | Comedy, Romance

Amy discovers some unusual feelings and urges when she meets Penny's ex-boyfriend, Zack. Meanwhile, Howard and Raj argue over who would be a superhero and who would be their sidekick.

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Cast	+ Add Cast
8 cast members

Name	Known for
Johnny Galecki Leonard Hofstadter Leonard Hofstadter See fewer	The Big Bang Theory (2007)
Jim Parsons Sheldon Cooper Sheldon Cooper See fewer	The Big Bang Theory (2007)
Kaley Cuoco Penny Penny See fewer	The Big Bang Theory (2007)
Simon Helberg Howard Wolowitz Howard Wolowitz See fewer	Florence Foster Jenkins (2016)
Kunal Nayyar Raj Koothrappali Raj Koothrappali See fewer	The Big Bang Theory (2007)
Mayim Bialik Amy Farrah Fowler Amy Farrah Fowler See fewer	Beaches (1988)
Melissa Rauch Bernadette Rostenkowski Bernadette Rostenkowski See fewer	The Big Bang Theory (2007)
Brian Thomas Smith Zack Johnson Zack Johnson See fewer	The Big Bang Theory (2007)