The Big Bang Theory: S09E09 - The Platonic Permutation

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The Platonic Permutation

The Platonic Permutation
Season: 9
Episode: 9
Air date: 2015-11-19

Guest stars: Laura Spencer, Elon Musk, Wayne Wilderson

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.