The Big Bang Theory/The Thespian Catalyst
From The TV IV
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The Thespian Catalyst is the fourteenth episode of the fourth season of The Big Bang Theory, and the seventy-seventh 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 (Amy Farrah Fowler), Melissa Rauch (Bernadette Rostenkowski)