William H. West

The Vivisectionist

Dr. Jardine - a Vivisectionist

The Girl Detective

Rumson / Strumfsky / Isaacson / Fairfax / Marsden / Rankin / Deacon / Merriman / Craven / Kerrigan / Brandon / Dr. Barry

The Chief of Police

John Franklin

The Quicksands

General Fields

The Invaders

William Sawyer

The Boomerang

Simon Watson - a Drug Manufacturer

The Driver Of The Deadwood Coach

Driver of the Deadwood Coach

The Organ Grinder

Pasquale