The Big Bang Theory Season 9 Episode 22 - The Fermentation Bifurcation

Airdate: 2016-Apr-28

Episode summary:

The gang goes to a wine bar and runs into Penny's old boyfriend, Zack. Also, Bernadette gets stuck spending the evening with Sheldon when she can't go wine tasting with the group, and things don't go as planned when Koothrappali introduces his new girlfriend, Claire.

About The Big Bang Theory series:

The Big Bang Theory is an American sitcom that stars Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Sara Gilbert, Melissa R...Show more >