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