Diretor/a
William Nigh
DIRETOR/A
Elenco (na ordem dos créditos)
Boris Karloff
Mr. Wong
Grant Withers
Capt. Street
Maxine Jennings
Myra
Evelyn Brent
Olga
George Lloyd
Devlin
Lucien Prival
Mohl
John St. Polis
Roemer
William Gould
Meisle
Hooper Atchley
Wilk
John Hamilton
Dayton
Wilbur Mack
Russell
Lee Tong Foo
Tchin
Lynton Brent
Tommy
Grace Wood
Mrs. Roemer
Frank Bruno
Lescardi(uncredited)
Ed Cassidy
Ambulance Doctor(uncredited)
Wheaton Chambers
Chemistry Lab Director(uncredited)
Clancy Cooper
Warehouse Man(uncredited)
George DeNormand
John(uncredited)
Lester Dorr
Coroner(uncredited)
Herbert Evans
Wilk's Butler(uncredited)
Dick Reinhart
Dock Worker(uncredited)