The Big Bang Theory/The Propagation Proposition

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The Propagation Proposition
Season 12, Episode 12
Airdate January 10, 2019
Production Number T12.16012
Teleplay by Maria Ferrari &
Dave Goetsch &
Eric Kaplan
Story by Chuck Lorre &
Steve Holland &
Jeremy Howe
Directed by Mark Cendrowski
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The Big Bang TheorySeason Twelve
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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)

Guest Starring: Brian George (Dr. Koothrappali), Brian Thomas Smith (Zack), Rati Gupta (Anu), Lindsey Kraft (Marissa)

Co-Starring: Shay Ali (Greg)


Plot Overview


Arc Advancement





The Show

Behind the Scenes

Allusions and References

Memorable Moments