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The Griffin Equivalency is the fourth episode of the second season of The Big Bang Theory, and the twenty-first episode overall.
Johnny Galecki (Leonard Hofstadter),
Jim Parsons (Sheldon Cooper),
Kaley Cuoco (Penny),
Simon Helberg (Howard Wolowitz),
Kunal Nayyar (Rajesh Koothrappali)
Special Appearance by:
Charlie Sheen (Himself)
Mark Harelik (Dr. Gablehauser),
Brian George (Dr. Koothrappali),
Alice Amter (Mrs. Koothrappali)
Behind the Scenes
Allusions and References