The Big Bang Theory 12×12
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-fianc�e, Anu.
Serie: The Big Bang Theory
Director: Bill Prady, Chuck Lorre
Guest Star: Jim Parsons, Johnny Galecki, Kaley Cuoco, Kevin Sussman, Kunal Nayyar, Mayim Bialik, Melissa Rauch, Simon Helberg