A New York University professor returns from a rescue mission to the Amazon rainforest with the footage shot by a lost team of documentarians who were making a film about the area's local cannibal tribes.

Three friends out to disprove cannibalism meet two men on the run who tortured and enslaved a cannibal tribe to find emeralds, and now the tribe is out for revenge.

A psychic seemingly dies of fright during a séance where she sees a vision of a Dunwich priest hanging himself in a church cemetery. New York City reporter Peter Bell investigates and learns that the priest's suicide has somehow opened a portal to Hell that must be sealed by All Saints Day, or else the dead will overtake humanity.