The Big Bang Theory - Season 9 Episode 22 -
Season 9, Episode 22 - The Fermentation Bifurcation
Sheldon and Bernadette spend the evening together while the rest of the gang go to a wine tasting party, but things get uncomfortable for Raj when Penny's ex-boyfriend Zack shows up and takes an interest in Claire.
Please explain the problem in a few words.
Max 255 characters.
Max 255 characters.