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- Season 9 Episode 22 -

The Fermentation Bifurcation

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.

Year started: 2007
IMDB rating: 8.4
Creators: Chuck Lorre  Bill Prady 
Categories: Comedy
Stars: Johnny Galecki  Jim Parsons  Kaley Cuoco  Simon Helberg  Kunal Nayyar  Mayim Bialik  Melissa Rauch 
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