The Big Bang Theory

The Propagation Proposition (Season 12, Episode 12)

TV-PG

TV Episode | 20 min | Comedy, Romance

Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help; Koothrappali attempts to mend things with his ex-fiancee Anu.

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Cast	+ Add Cast
13 cast members

Name	Known for
Johnny Galecki Leonard Hofstadter Leonard Hofstadter See fewer	The Big Bang Theory (2007)
Jim Parsons Sheldon Cooper Sheldon Cooper See fewer	The Big Bang Theory (2007)
Kaley Cuoco Penny Hofstadter Penny Hofstadter See fewer	The Big Bang Theory (2007)
Simon Helberg Howard Wolowitz Howard Wolowitz See fewer	Florence Foster Jenkins (2016)
Kunal Nayyar Raj Koothrappali Raj Koothrappali See fewer	The Big Bang Theory (2007)
Mayim Bialik Amy Farrah Fowler Amy Farrah Fowler See fewer	Beaches (1988)
Melissa Rauch Bernadette Rostenkowski Bernadette Rostenkowski See fewer	The Big Bang Theory (2007)
Brian George Dr. V.M. Koothrappali Dr. V.M. Koothrappali See fewer	Batman: The Killing Joke (2016)
Brian Thomas Smith Zack Johnson Zack Johnson See fewer	The Big Bang Theory (2007)
Rati Gupta Anu Anu See fewer	The Big Bang Theory (2007)
Lindsey Kraft Marissa Johnson Marissa Johnson See fewer	Getting On (2013)
Shay Ali Greg Greg See fewer	The Big Bang Theory (2007)
Chip Chinery Bob (uncredited) Bob (uncredited) See fewer	The Upshaws (2021)