The Big Bang Theory The Fermentation Bifurcation (Season 9, Episode 22)
TV-PG
TV Episode | 20 min | Comedy, Romance

Primary photo for The Fermentation Bifurcation

The Big Bang Theory

The Fermentation Bifurcation (Season 9, Episode 22)

TV-PG

TV Episode | 20 min | Comedy, Romance

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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Cast	+ Add Cast
9 cast members

Name	Known for
Johnny Galecki Leonard Hofstadter Leonard Hofstadter See fewer	The Big Bang Theory (2007)
Jim Parsons Sheldon Cooper Sheldon Cooper See fewer	The Big Bang Theory (2007)
Kaley Cuoco Penny Hofstadter Penny Hofstadter See fewer	The Big Bang Theory (2007)
Simon Helberg Howard Wolowitz Howard Wolowitz See fewer	Florence Foster Jenkins (2016)
Kunal Nayyar Raj Koothrappali Raj Koothrappali See fewer	The Big Bang Theory (2007)
Mayim Bialik Amy Farrah Fowler Amy Farrah Fowler See fewer	Beaches (1988)
Melissa Rauch Bernadette Rostenkowski Bernadette Rostenkowski See fewer	The Big Bang Theory (2007)
Brian Thomas Smith Zack Johnson Zack Johnson See fewer	The Big Bang Theory (2007)
Alessandra Torresani Claire Claire See fewer	The Big Bang Theory (2007)