The Big Bang Theory/The Propagation Proposition
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The Propagation Proposition is the twelfth episode of the twelfth season of The Big Bang Theory, and the two hundred sixty-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)
Co-Starring: Shay Ali (Greg)