When a terrified toy salesman is mysteriously attacked and brought to the hospital babbling and clutching the year's most popular Halloween costume, an eerie pumpkin mask, Dr Daniel Challis (Tom Atkins) is thrust into a terrifying Halloween nightmare. Working with the salesman's daughter, Ellie (Stacey Nelkin), he traces the mask to the Silver Shamrock Novelties company and its founder, Conal Cochran (Dan O'Herlihy). Ellie and Daniel attempt to uncover Cochran's shocking Halloween plan before the trick-or-treaters across the country are kept from ever coming home, in this terrifying thriller from writer/director Tommy Lee Wallace.