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The Big Bang Theory/The Alien Parasite Hypothesis
From The TV IV
| 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 |
| Stream |  |
| ← 4x09 The Boyfriend Complexity |
4x11 → The Justice League Recombination |
| The Big Bang Theory — Season Four | |
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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)
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