The Big Bang Theory
Thursdays 8/7c
First Look: Penny Gets An Unexpected Visit From Her Ex On The Big Bang Theory
Sheldon plans an exciting evening while Leonard quietly reads on the couch.
"The Fermentation Bifurcation" (Episode 22, Season 9 of The Big Bang Theory)
By viewing our video content you are accepting the terms of our Video Services Policy. © 2018 CBS Interactive. All rights reserved.