The Big Bang Theory Season 12 Episode 12

8 votes, average 5.5 out of 10

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.

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Episode Name:The Propagation Proposition
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