The Big Bang Theory/The Expedition Approximation
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The Expedition Approximation is the sixth episode of the eighth season of The Big Bang Theory, and the one hundred sixty-fifth episode overall.
Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco-Sweeting (Penny), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali), Mayim Bialik (Dr. Amy Farrah Fowler), Melissa Rauch (Dr. Bernadette Rostenkowski-Wolowitz)