Children playing in a swamp ca 1800, with human skulls

1817. Mani, Greece. Two rivals families decide to marry their children. After a while their grandchild is born and found dead in the river. Everyone blames Theofano, a girl, who is a witch.

A group of high-school kids set out to play a Halloween prank at an abandoned house, but once they enter they become victims of a demonic witch who has set her wrath upon them.

An ancient relic is found at the bottom of a local lake which resurrects the severed head of Robert Gross, aka Swamphead. A group of hapless teens come across the relic and their weekend camping trip becomes a nightmare of blood, feces, and more head than a night in Tijuana. Can they destroy the zombie head or will they die trying?