The Big Bang Theory/The Platonic Permutation
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The Platonic Permutation is the ninth episode of the ninth season of The Big Bang Theory, and the one hundred ninety-second episode overall.
Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco (Penny Hofstadter), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali), Mayim Bialik (Dr. Amy Farrah Fowler), Melissa Rauch (Dr. Bernadette Rostenkowski-Wolowitz), Laura Spencer (Emily Sweeney)
Special Appearance by: Elon Musk (Himself)
Guest Starring: Wayne Wilderson (Travis)