The Big Bang Theory/The 2003 Approximation
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The 2003 Approximation is the fourth episode of the ninth season of The Big Bang Theory, and the one hundred eighty-seventh episode overall.
Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco (Penny Hofstadter), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali), Mayim Bialik (Dr. Amy Farrah Fowler), Melissa Rauch (Dr. Bernadette Rostenkowski-Wolowitz), Kevin Sussman (Stuart Bloom), Laura Spencer (Emily Sweeney)