The Big Bang Theory

The Big Bang Theory

The Propagation Proposition (12x12)


Air date: Jan 10, 2019

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.

  • Score 8.8
  • Premiered: Sep 2007
  • Episodes: 279
  • Followers: 54,9k
  • Rank #2
  • Ended
  • CBS
  • Thursday at 8
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