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The Big Bang Theory/The Platonic Permutation
From The TV IV
| The Platonic Permutation | |
| Season 9, Episode 9 | |
| Airdate | November 19, 2015 |
| Production Number | 4X7209 / T12.15209 |
| Teleplay by | Steve Holland & Maria Ferrari & Adam Faberman |
| Story by | Jim Reynolds & Jeremy Howe & Tara Hernandez |
| Directed by | Mark Cendrowski |
| Stream |  |
| ← 9x08 The Mystery Date Observation |
9x10 → The Earworm Reverberation |
| The Big Bang Theory — Season Nine | |
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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)
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