Series episode
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The Big Bang Theory > Season 4 > Episode 10 (73)

The Alien Parasite Hypothesis

Airdate: 09.12.2010

Cast:

Johnny Galecki...Leonard Hofstadter
Jim Parsons...Sheldon Cooper
Kaley Cuoco...Penny
Simon Helberg...Howard Wolowitz
Kunal Nayyar...Raj Koothrappali
Mayim Bialik...Amy Farrah Fowler
Melissa Rauch...Bernadette Rostenkowski
Brian Smith...Zack

Crew:

Mark Cendrowski
...Direction
Lee Aronsohn
Maria Ferrari
Jim Reynolds
...Script

Plot:

Amy finds she has sexual feelings for Penny's ex-boyfriend Zack, while Raj and Howard try to prove who would be the better superhero.
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