This sci-fi fantasy film was supposedly inspired by a line from an Edgar Allen Poe poem. It is also the last film made by distinguished director Jacques Tourneur.

The adventure begins when the widowed ruler of a sub-oceanic kingdom spies a woman on the land who closely resembles his late wife. Believing that she is the reincarnation of his beloved spouse, the mer-king orders his gill men to kidnap her. Fortunately two courageous divers and their pet rooster brave the mysterious depths and the deadly Gillmen to rescue her