0
355 min
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.
| Name | Character | Team | |
|---|---|---|---|
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Maurice Costello | Harold Stanley | Unowned |
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Ethel Grandin | Florence Montrose | Unowned |
| Thomas J. McGrane | Dr. Burton Montrose | Unowned | |
| Olga Olonova | Vanya Tosca | Unowned | |
| William Cavanaugh | Doctor's Assistant | Unowned | |
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John A. Milton | Layton Parrish (as John Milton) | Unowned |
| N.J. Thompson | Jim Tanner | Unowned | |
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Eugene Strong | Robert Clayton | Unowned |
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Lorna Volare | Little girl | Unowned |