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The Hamburger Postulate is the fifth 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)
Special Guest Star:
Sara Gilbert (Leslie Winkle)
Behind the Scenes
Allusions and References