The Imitation Perturbation Season 12, Episode 6 - Aired October 25, 2018
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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Director: Mark Cendrowski
- The title refers to Howard dressing up as Sheldon for Halloween, prompting a retaliatory response from Sheldon.