The Big Bang Theory: Season 9, Episode 22

The Fermentation Bifurcation (Apr 28, 2016)

TV-PGTV Episode20 min.Comedy | Romance
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SUMMARY
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.

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