The Big Bang Theory S12E6 backdrop
The Big Bang Theory poster

The Big Bang Theory (2007)

S12E6 The Imitation Perturbation

Oct 25, 2018 Season 12 Episode 6 Comedy

Howard decides to don a Sheldon costume for Halloween, prompting Sheldon to plot his revenge during Leonard and Penny's Halloween gathering. Meanwhile, Leonard is taken aback when he realizes that Penny has forgotten all about their first kiss.

Previous S12E5
All Episodes
Next S12E7