Season 12, Episode 6, is the final Halloween-themed episode of The Big Bang Theory and is widely remembered for its sharp character parodies. Key Plotlines
Leonard's Inspector Gadget propeller was originally so long it hit people on set, requiring the wardrobe team to cut it down several times for balance. [S12E6] The Imitation Perturbation
Howard arrives at work dressed as Sheldon, mimicking his "spot" and bathroom schedule. Hurt by the ridicule, Sheldon and Amy retaliate at Leonard and Penny’s party by dressing as Howard and Bernadette. Amy’s "spot-on" high-pitched impression of Bernadette is a highlight, though it causes genuine friction between the couples. Season 12, Episode 6, is the final Halloween-themed
The Imitation Perturbation | The Big Bang Theory Wiki | Fandom [S12E6] The Imitation Perturbation