The Crimson Stain Mystery 1916

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.

Cast:

Maurice Costello
Harold Stanley 

Ethel Grandin
Florence Montrose 

Thomas J. McGrane
Dr. Burton Montrose 

Olga Olonova
Vanya Tosca 

William Cavanaugh
Doctor's Assistant 

John A. Milton
Layton Parrish (as John Milton)