The Unknown Terror is a 1957 American science fiction/horror film. The film was written by Kenneth Higgins and directed by Charles Marquis Warren.Synopsis
The mysterious disappearance of Jim Wheatley, while exploring the "cave of the dead" near a Mexican village, brings his sister, Gina, and her husband, Dan Matthews, to the territory to search for him. Embittered, crippled Pete Morgan insists on going along and reminds Dan that his condition is Dan's fault since it happened in an accident in which Pete saved Dan's life. Plus, Gina was Pete's sweetheart before the accident.
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