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The Gorilla Experiment is the tenth episode of the third season of The Big Bang Theory, and the fiftieth episode overall.
Johnny Galecki (Leonard Hofstadter),
Jim Parsons (Sheldon Cooper),
Kaley Cuoco (Penny),
Simon Helberg (Howard Wolowitz),
Kunal Nayyar (Rajesh Koothrappali)
Melissa Rauch (Bernadette),
Carol Ann Susi (Mrs. Wolowitz (voice))
Behind the Scenes
Allusions and References