Halloween III: Season of the Witch (1982)

Dr. Daniel Challis and Ellie Grimbridge stumble onto a gruesome murder scheme when Ellie's novelty-salesman father, Harry, is killed while in possession of a halloween mask made by the Silver Shamrock mask company. The company's owner, Conal Cochran, wants to return Halloween to its darker roots using his masks -- and his unspeakable scheme would unleash death and destruction across the country.