The Big Bang Theory/The Egg Salad Equivalency
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The Egg Salad Equivalency is the twelfth episode of the sixth season of The Big Bang Theory, and the one hundred twenty-third episode overall.
Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco (Penny), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali), Mayim Bialik (Dr. Amy Farrah Fowler), Melissa Rauch (Dr. Bernadette Rostenkowski-Wolowitz)
Special Guest Star: Regina King (Mrs. Davis)
Guest Starring: Margo Harshman (Alex)