The Big Bang Theory/The Infestation Hypothesis
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The Infestation Hypothesis is the second episode of the fifth season of The Big Bang Theory, and the eighty-ninth 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)