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The Big Bang Theory

Series 6 Episode 6 The Extract Obliteration

Sheldon gets excited when Stephen Hawking agrees to play against him in an online game of `Words with Friends'. However, when Sheldon starts to dominate the game, Hawking is less than pleased. Elsewhere, Penny signs up for a class at community college but feels reluctant to tell Leonard about it. Directed by: Mark Cendrowski.

Johnny Galecki Leonard Hofstadter
Jim Parsons Sheldon Cooper
Kaley Cuoco Penny
Simon Helberg Howard Wolowitz
Kunal Nayyar Rajesh Koothrappali