Aired Wednesday August 10, 6:00pm - 6:30pmon E4 +1

The Big Bang Theory

Series 12 Episode 12: The Propagation Proposition

Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help. Then, Koothrappali attempts to mend things with his ex-fiancee Anu.

Category
Sitcom
Original air date
2019-01-10
Cast and crew
  • Mark CendrowskiDirector
  • Johnny GaleckiLeonard Hofstadter
  • Jim ParsonsSheldon Cooper
  • Kaley CuocoPenny
  • Simon HelbergHoward Wolowitz
  • Kunal NayyarRaj Koothrappali
+ Show all cast and crew