A small remote island is the home for voodoo rites, death cults and an evil priest named Damballah. Local law officials turn a blind eye to their evil ways until Captain Labesch arrives from the mainland. Determined to crack down on the island's lawlessness and clean up the ineffectual, hard-drinking police force, Labeasch appeals to plantation tycoon Carl Van Molder for assistance. Van Molder owns nearly half the island and has spent his life studying parapsychology and secret powers of the mind. Meanwhile, beautiful native girls are being transformed into zombies! A sinister snake dancer named Kalea impels them to attack and devour anyone who gets too close to their unholy rituals. AKA: "Cult of the Dead," "Isla de Los Muertos," "Isle of the Living Dead and Snake People."
"Voodoo! Zombies! Cannibal women!" exclaims the Chief of Police (Ralph Bertrand) after finding a mutilated corpse shortly assuming control of a mysterious island in the Caribbean. Also newly arrived to the island is Mademoiselle Wunderberg, the niece of mysterious Mr. Van Molder (Boris Karloff) a plantation owner who conducts strange experiments with telekinesis involving his maid Kalea (Yolanda Montes), queen of voodoo. Kalea does lots of scantily dressed snake dancing amid the flames and beating bongo drums, while a painted dwarf in sunglasses keeps the candles lit, and the victims whipped to within an inch of their lives. Elsewhere, a group of cannibal women devour errant men, and one of Van Molder's ringleaders has resurrected a zombie for necrophiliac purposes. In the film's weirdest moment, Kalea casts a spell over Mmme. Wunderberg and she has a dream her double rises out of a coffin and sexually molests herself with a snake. It's all part of the mysterious plan to make Damballah appear, but the identity of Damballah is a mystery, as are what other horrors may await in this bizarre Mexican-American production, one of Boris Karloff's final films.