In attempting to develop a chemical which would make a person super-intelligent, Dr. Montrose fails and the subjects of his experiments metamorphose into hideous monsters who band together and prey on humans. With the police stymied, a young detective attempts to track down the leader of the group of killers, known only to have a small crimson stain in one eye.
Top Cast
Maurice Costello as Harold Stanley
Ethel Grandin as Florence Montrose
Thomas J. McGrane as Dr. Burton Montrose
Olga Olonova as Vanya Tosca
William Cavanaugh as Doctor's Assistant
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