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The Cooper-Hofstadter Polarization is the ninth episode of the first season of The Big Bang Theory.
Johnny Galecki (Leonard Hofstadter),
Jim Parsons (Sheldon Cooper),
Kaley Cuoco (Penny),
Simon Helberg (Howard Wolowitz),
Kunal Nayyar (Rajesh Koothrappali)
Talbott Chin (Chinese Leonard),
Howard Chan (Chinese Sheldon)
Behind the Scenes
Allusions and References