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