Hospital emergency room Dr. Daniel "Dan" Challis (Tom Atkins) and Ellie Grimbridge (Stacey Nelkin), the daughter of a murder victim, uncover a terrible plot by small-town mask maker Conal Cochran (Dan O'Herlihy), a madman who's planning a Halloween mass murder utilizing an ancient Celtic ritual. The ritual involves a boulder stolen from Stonehenge, the use of Silver Shamrock masks and a triggering device contained in a television commercial -- all designed to kill millions of children.
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