Cast
Boris Karloff
James Lee Wong
Grant Withers
Police Capt. Sam Street
Maxine Jennings
Myra Ross
Evelyn Brent
Olga Petroff / Countess Dubois / Sophie Dome
George Lloyd
Devlin
Lucien Prival
Anton Mohl
John St. Polis
Carl Roemer
William Gould
Theodore Meisle
Hooper Atchley
Christian Wilk
John Hamilton
Simon Dayton
Wilbur Mack
Russell
Lee Tung Foo
Tchin
Lynton Brent
Tommy
GW
Grace Wood
Mrs. Roemer
FB
Frank Bruno
Lescardi (uncredited)
Ed Cassidy
Ambulance Doctor (uncredited)
Wheaton Chambers
Chemistry Lab Director (uncredited)
Clancy Cooper
Warehouse Man (uncredited)
GD
George DeNormand
John (uncredited)
Lester Dorr
Coroner (uncredited)
Herbert Evans
Wilk's Butler (uncredited)
DR
Dick Reinhart
Dock Worker (uncredited)
Crew
WTL
William T. Lackey
Production
William Nigh
Directing
HB
Houston Branch
Writing
SRD
Scott R. Dunlap
Production
SRD
Scott R. Dunlap
Production
KZ
Karl Zint
Sound
RFS
Russell F. Schoengarth
Editing
HW
Hugh Wiley
Writing
HN
Harry Neumann
Camera
EJK
Edward J. Kay
Sound
CJB
Charles J. Bigelow
Production
GB
Gordon Bau
Costume & Make-Up
HG
Harry Grundstrum
Art
AM
Abe Meyer
Sound
EH
E.R. Hickson
Crew
WE
W.B. Eason
Directing
