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Set in contemporary England, the film follows Doctor Brockton (Joan Crawford) who learns that in the caves of the countryside, a troglodyte is alive and might be able to be helped and even domesticated. She gets the creature to the surface and attempts to train him, but runs into trouble as a few people oppose this, especially a local businessman afraid of negative commercial consequences, Sam Murdock (Michael Gough). Murdock frees the creature, leading to a rampage.
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