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Pilot is the first 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)
Verneé Watson (Althea),
Brian Patrick Wade (Kurt)
Behind the Scenes
Allusions and References