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The Monster of Piedras Blancas is a 1959 independently made American black-and-white science fiction-monster film. It was produced by Jack Kevan, written and directed by Irvin Berwick, and stars Jeanne Carmen, Les Tremayne, John Harmon, Don Sullivan, Forrest Lewis, and Pete Dunn. The film was released by Filmservice Distributors Corporation as a double feature with Okefenokee.

The Monster of Piedras Blancas was influenced by Creature from the Black Lagoon (1954). Kevan, who had supervised the manufacture of the Gill-Man suit and worked on Mole People costumes at Universal-International, created the Piedras Blancas monster costume. Kevan employed several of his former Universal associates on the picture, including soundman Joe Lapis and prop master Eddie Keys.


In the sleepy California town of Piedras Blancas, Sturges, the lighthouse keeper, is very superstitious and concerned for the safety of his teenage daughter, Lucy. He leaves food for a sea monster who lives in a nearby cave. The locals disregard his warnings at first, but they begin to take notice when the bodies of people killed by the creature are found on the beach. A local scientist identifies a scale found near one of the bodies as belonging to a "diplovertebron", a prehistoric amphibious reptile long presumed extinct.