The Platonic Permutation

"**The Platonic Permutation**"
"The Platonic Permutation"
The Big Bang Theory episode
Episode no.	Season 9; Episode 9
Directed by	Mark Cendrowski
Story by	Jim Reynolds; Jeremy Howe; Tara Hernandez;
Teleplay by	Steve Holland; Maria Ferrari; Adam Faberman;
Production code	4X7209
Original air date	November 19, 2015
Running time	21 minutes
Guest appearances
	Elon Musk as himself; Wayne Wilderson as Travis;
Episode chronology
← Previous; "The Mystery Date Observation"	Next →; "The Earworm Reverberation"
	The Big Bang Theory (season 9)
	List of episodes

"The Platonic Permutation" is the ninth episode of the ninth season of The Big Bang Theory. The 192nd episode overall, it first aired on CBS on November 19, 2015. The story follows the characters throughout Thanksgiving. The first storyline explores Sheldon and Amy's relationship as they meet-up, after being broken up. The next subplot follows Bernadette, Raj, Emily and Howard where they volunteer at a soup kitchen and the last follows Leonard and Penny after they have a minor conflict as Penny forgets Leonard's birthday.

"The Platonic Permutation" features a guest appearance of South-African American entrepreneur and business magnate, Elon Musk as himself. Critics had mixed reviews of the episode. Critics praised Sheldon and Amy's storyline, but were critical of the other two subplots and Musk's appearance.

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