The Big Bang Theory

The Itchy Brain Simulation (Season 7, Episode 8)

TV-14

TV Episode | 21 min | Comedy, Romance

Sheldon demands Leonard make up for a mistake from their past. Penny confronts Raj's ex-girlfriend, Lucy.

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Cast	+ Add Cast
10 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 Penny 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)
Kate Micucci Lucy Lucy See fewer	When in Rome (2010)
Morgan Hewitt Lizzy Lizzy See fewer	CSI: NY (2004)
Meli Alexander Cheesecake Factory Patron (uncredited) Cheesecake Factory Patron (uncredited) See fewer	Framed (IV)