The Big Bang Theory/The Alien Parasite Hypothesis

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The Alien Parasite Hypothesis
Season 4, Episode 10
Airdate December 9, 2010
Production Number 3X6660
Teleplay by Lee Aronsohn &
Jim Reynolds &
Maria Ferrari
Story by Chuck Lorre &
Steven Molaro &
Steve Holland
Directed by Mark Cendrowski
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The Alien Parasite Hypothesis is the tenth episode of the fourth season of The Big Bang Theory, and the seventy-third episode overall.

Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco (Penny), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali), Mayim Bialik (Amy Farrah Fowler), Melissa Rauch (Bernadette Rostenkowski)

Guest Starring: Brian Thomas Smith (Zack)


Plot Overview


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