The Big Bang Theory

Season 12 Episode 12

The Propagation Proposition

Aired Thursday 8:00 PM Jan 10, 2019 on CBS
7.5
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The Propagation Proposition
AIRED:
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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