The Big Bang Theory The Imitation Perturbation (Season 12, Episode 6)
TV-PG
TV Episode | 19 min | Comedy, Romance

Primary photo for The Imitation Perturbation

The Big Bang Theory

The Imitation Perturbation (Season 12, Episode 6)

TV-PG

TV Episode | 19 min | Comedy, Romance

When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party. Also, Leonard is shocked that Penny doesn't remember their first kiss.

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Cast	+ Add Cast
14 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)
Kevin Sussman Stuart Bloom Stuart Bloom See fewer	Burn After Reading (2008)
Brian Posehn Bert Kibbler Bert Kibbler See fewer	Run Ronnie Run (2002)
Rati Gupta Anu Anu See fewer	The Big Bang Theory (2007)
Pamela Adlon Halley Wolowitz (voice) Halley Wolowitz (voice) See fewer	Better Things (2016)
Dave Theune Dr. Graybel (as David Theune) Dr. Graybel (as David Theune) See fewer	I Am Not Okay with This (2020)
Darryl D. Stewart Cafeteria Patron in Star Trek Uniform (uncredited) Cafeteria Patron in Star Trek Uniform (uncredited) See fewer	Bandits (2001)
Stephen John Williams Cafe Patron (uncredited) Cafe Patron (uncredited) See fewer	Fitness Discovered