Duration: 22m

TV-PG 0.0 Comedy / Romance

The Big Bang Theory S12E12

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

Release Date: January 10, 2019 (USA)

Creator: Chuck Lorre, Bill Prady

Cast: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Melissa Rauch, Mayim Bialik, Kevin Sussman, Bob Newhart