The Imitation Perturbation
The Big Bang Theory – Season 12
When Howard dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party. Leonard is shocked that Penny doesn't remember their first kiss.
Cast
Johnny Galecki
Leonard Hofstadter
Jim Parsons
Sheldon Cooper
Kaley Cuoco
Penny
Simon Helberg
Howard Wolowitz
Kunal Nayyar
Rajesh Koothrappali
Melissa Rauch
Bernadette Rostenkowski
Mayim Bialik
Amy Farrah Fowler
Kevin Sussman
Stuart Bloom
Pamela Adlon
Halley Wolowitz (voice)
David Theune
Dr. Graybel
Rati Gupta
Anu
Brian Posehn
Bert Kibbler
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