The Big Bang Theory Season 12 Episode 12
The Propagation Proposition
Episode Description: The Propagation Proposition
The Big Bang Theory Season 12 Episode 12 Watch Online - Penny’s ex-boyfriend, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard for help. Also, Koothrappali attempts to mend things with his ex-fiancée, Anu.
