The Big Bang Theory > Season 12 > Episode 12 - The Propagation Proposition

Watch The Big Bang Theory S12E12: 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.

 
Number: Season 12, Episode 12
Title: The Propagation Proposition
Air Date: January 10, 2019

The Big Bang Theory (2007) | S12E12 - The Propagation Proposition Watch

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