Isle of the Snake People, is a 1971 Mexican horror film directed by Juan Ibáñez and starring Boris Karloff and Julissa.

Meanwhile, beautiful native girls are being transformed into zombies, and a sinister snake dancer named Kalea leads them to attack and devour any meddling policemen who get too close to their unholy rituals.

When Annabella is kidnapped and prepared to be the cult's latest human sacrifice, Labische and Wilhelm have to infiltrate their ranks to save her, and they finally learn the secret identity of the all-powerful Damballah.

Some additional scenes involving the van Molder character (in Snake People) were filmed using a Karloff stand-in named Jerry Petty.

[3] Due to the unexpected death of Vergara, the release of the film was held up to determine ownership rights of inheritance under Mexican law.

[4] The four Azteca Films productions for which Karloff shot his scenes in Los Angeles were released by Columbia Pictures over a two-year period after he had died in 1969.

[5] Writing in The Zombie Movie Encyclopedia, academic Peter Dendle said, "Though sometimes strange to the point of psychedelic, this tame offering consists of interminable scenes of native rites, women trying to look seductively evil, and shots of snakes.