Where To Stream The Big Bang Theory Season 12 Episode 12
The Propagation Proposition
- Aired January 10, 2019
- 30 Min
- Rated 7.0
- Number 225 Of 279 Rated Episodes
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.