It was produced by Jack Kevan, directed by Irvin Berwick,[1] and stars Jeanne Carmen, Les Tremayne, John Harmon, Don Sullivan, Forrest Lewis, and Pete Dunn.

[2] 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.

For this film's fictional "diplovertebron", Kevan cut cost and labor time by using existing molds for the feet (cast from those of the Metaluna Mutant from This Island Earth) and the oversized hands (designed originally for The Mole People).

Vanwick received sweetheart deals for production vehicles and equipment, the studio's way of helping many of its laid-off technicians who found work on the independent film.

[citation needed] The film was shot entirely on location, but oddly enough, not at the real Point Piedras Blancas, which is north of San Simeon on the California coast.

[13] Dave Sindelar from Fantastic Movie Musings and Ramblings gave it a mixed review, complimenting the film's gory effects, soundtrack, and Sullivan and Tremayne's performances.

[14] AllMovie gave the film a positive review, calling it "a horror movie with a lot of familiar elements but just enough offbeat touches to keep viewers coming back for 50 years or more".