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