Spike Holland
Victor Jory
Valerie Howett
Iris Meredith
Cop / Detective Charlie
Jack Cheatham
Stevens / Agent 4-X / Thug Pilot
Edmund Cobb
Frank
Kernan Cripps
Thug
Charles Dorety
Michael Bellamy
Kenne Duncan
Brewster
John Elliott
Henderson
Herbert Evans
Pete
Franklyn Farnum
Butch
Al Ferguson
Turk Martin
Eddie Fetherston
Abel Bellamy
James Craven
Kardak
Chuck Hamilton
Martin
Harry Harvey
Cop
Edward Hearn
Lab Guard
Jack Hendricks
Worthington
Lloyd Ingraham
Theater Attendant Charlie
Warren Jackson
Tinder
John Paul Jones
Jake
Johnny Kascier
Tardoni
Charles King
Detective with Shiner
Tom London
Savini
Robert Fiske
Sam Lufkin
Mrs. Patton
Mary MacLaren
Narrator (voice)
Knox Manning
Bruce Mitchell
Lanton
Bud Osborne
Train Conductor
Fred Parker
West
Constantine Romanoff
Dick Rush
Darcy
Cy Schindell
Vrooner
Harry Tenbrook
Elaine Bellamy
Dorothy Fay
Lefty Brent
Anthony Warde
Martel aka Harry Madison
Duke York
Biff
Bert Young
Parker Howett
Forrest Taylor
Henchman Brad
Jack Ingram
Inspector Ross
Joseph W. Girard
Dinky Stone
Kit Guard
Capt. Thompson
Fred Kelsey
Novel
Edgar Wallace
Director
James W. Horne
Screenplay
Morgan Cox
Jesse Duffy