The Big Bang Theory 12×12 All Sneak Peeks “The Propagation Proposition”

The Big Bang Theory 12×12 “The Propagation Proposition” Season 12 Episode 12 All Sneak Peeks – Penny’s ex-boyfriend, Zack (Brian Thomas Smith), 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 (Rait Gupta), on THE BIG BANG THEORY, Thursday, January 10th on CBS.