Halloween III: Season Of The Witch.
A doctor on call gets involved in a apparent murder-suicide which the daughter of the man killed teams up with the doctor and goes to a town where a toy maker plans to kill using Halloween Masks and a ancient ritual.
How can one film I hated growing up become a total gem, Dan O'Herlihy plays Conrad Cochran the genius toy maker who plans a spectacular phenomenon on halloween with a advert and kids to be wearing their masks. Tom Atkins plays the doctor Daniel Challis who gets involved in the mystery of the man carrying a mask and Stacey Nelkin as Ellie the daughter of the man killed. The story does seem a bit far fetched using Stonehenge as a metaphor for the evil plan but that can be forgiven as the film does have it's suspenseful moments and great visual effects.
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