Cast
Ed Cassidy
Ambulance Doctor (uncredited)
Clancy Cooper
Warehouse Man (uncredited)
Herbert Evans
Wilk's Butler (uncredited)
Maxine Jennings
Myra Ross
John Hamilton
Simon Dayton
Lucien Prival
Anton Mohl
John St. Polis
Carl Roemer
William Gould
Theodore Meisle
Lynton Brent
Tommy
Wheaton Chambers
Chemistry Lab Director (uncredited)
Boris Karloff
James Lee Wong
Grant Withers
Police Capt. Sam Street
Evelyn Brent
Olga Petroff / Countess Dubois / Sophie Dome
George Lloyd
Devlin
Hooper Atchley
Christian Wilk
Lee Tung Foo
Tchin
Lester Dorr
Coroner (uncredited)
Wilbur Mack
Russell