Echoing narration informs us about the "diabolical" new threat of voodoo on the island of "Korbai" near Haiti and a laughing, sneering midget in sunglasses cuts the head off a (real) chicken. Then Anabella (played by Julissa), a member of the International Anti-Saloon League informs some soldiers that, "Modern science has proved that alcohol is responsible for 99.2% of all the worlds sins!" She arrives on the island with others to visit her uncle Carl von Molder (Boris Karloff or his masked double).

Meanwhile, blue-faced zombies are overrunning the island. Voodoo cultists kill soldiers with a blowgun, strangulation and machete and regularly resurrect the dead with the help of the dwarf (who whips them). Rabid zombie women eat a man and one soldier adopts one as his girlfriend to scratch his back and fan him. ("Imagine a beautiful woman that can't talk. Every man's dream!") The niece has an extremely bizarre dream of her evil double suggestively sucking on a (real, live) snake before kissing her (?)

Little of this movie makes sense and the ending stinks, but it has some weird, senseless stuff to recommend. It's one of four much-hated movies Karloff did in 1968 before his death, constituting his final film work.