The Big Bang Theory/The 21-Second Excitation
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The 21-Second Excitation is the eighth episode of the fourth season of The Big Bang Theory, and the seventy-first 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)
Guest Starring: Eric Andre (Joey)