The Big Bang Theory

Season 9 Episode 22: The Fermentation Bifurcation

Air Date: 2016-04-28

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.