The Big Bang Theory

The Platonic Permutation

Series 9 - Episode 9 The Platonic Permutation



Sheldon and Amy try hanging out as friends when they spend Thanksgiving together at the aquarium. Howard reluctantly agrees to volunteer at a soup kitchen with Bernadette, Raj and Emily. Meanwhile, Penny discovers that Leonard knows more about her than she thought.

Cast & Crew

Leonard Hofstadter Johnny Galecki
Sheldon Cooper Jim Parsons
Penny Kaley Cuoco
Howard Wolowitz Simon Helberg
Raj Koothrappali Kunal Nayyar
Amy Farrah Fowler Mayim Bialik
Bernadette Rostenkowski Melissa Rauch
Emily Sweeney Laura Spencer
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