The Big Bang Theory

The Propagation Proposition

Season 12: Episode 12    | Next

Airs: Thursday, Jan 10 2019 at 8:00pm on CBS TV TV-PG Comedy (Genre) Writer: Chuck Lorre, Bill Prady, Steve Molaro, Steve Holland, Jim Reynolds Composers:Gregory Sweeney

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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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