The Big Bang Theory

Season 9 Episode 22

The Fermentation Bifurcation

22
Aired Monday 8:00 PM Apr 28, 2016 on CBS
7.5
out of 10
User Rating
72 votes

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Episode Summary

EDIT

The gang goes to a wine bar and runs into Penny's old boyfriend, Zack, who hits it off with Raj's girlfriend, Claire. Meanwhile, Bernadette and Sheldon spend an evening together.

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