Guest Star: Elon Musk
The Platonic Permutation
Season 9, Episode 9 - Aired November 19, 2015
Sheldon and Amy try hanging out as friends when they spend Thanksgiving together at the aquarium. Also, Wolowitz reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj and Emily, and Penny discovers that Leonard knows more about her than she thought.
Appeared as Himself