The Big Bang Theory: S09E22 - The Fermentation Bifurcation

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The Fermentation Bifurcation

The Fermentation Bifurcation
Season: 9
Episode: 22
Air date: 2016-04-28

Guest stars: Alessandra Torresani, Brian Thomas Smith

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.