Episode Titles: Fermentation
You are viewing a list of 1 The Big Bang Theory episode featuring "Fermentation" in their title.
The Fermentation Bifurcation
Season 9, Episode 22 - Aired April 28, 2016
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.