The Big Bang Theory/The Extract Obliteration
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The Extract Obliteration is the sixth episode of the sixth season of The Big Bang Theory, and the one hundred seventeenth episode overall.
Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco (Penny), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali), Mayim Bialik (Dr. Amy Farrah Fowler), Melissa Rauch (Dr. Bernadette Rostenkowski-Wolowitz)
Guest Starring: Stephen Hawking (Himself (voice))