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The Big Bang Theory season 12 episode 12

The Propagation Proposition

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.

The Big Bang Theory: Season 12 Episode 12
The Big Bang Theory: Season 12 Episode 12
The Big Bang Theory: Season 12 Episode 12
Jan. 10, 2019

The Big Bang Theory season 12