Victor Jory

Spike Holland

Iris Meredith

Valerie Howett

James Craven

Abel Bellamy

Robert Fiske

Savini

Dorothy Fay

Elaine Bellamy

Forrest Taylor

Parker Howett

Jack Ingram

Henchman Brad

Joseph W. Girard

Inspector Ross

Kit Guard

Dinky Stone

Fred Kelsey

Capt. Thompson

Jack Cheatham

Cop / Detective Charlie

Edmund Cobb

Stevens / Agent 4-X / Thug Pilot

Kernan Cripps

Frank

Charles Dorety

Thug

Kenne Duncan

Michael Bellamy

John Elliott

Brewster

Herbert Evans

Henderson

Franklyn Farnum

Pete

Al Ferguson

Butch

Eddie Fetherston

Turk Martin

Chuck Hamilton

Kardak

Harry Harvey

Martin

Edward Hearn

Cop

Jack Hendricks

Lab Guard

Lloyd Ingraham

Worthington

Warren Jackson

Theater Attendant Charlie

John Paul Jones

Tinder

Johnny Kascier

Jake

Charles King

Tardoni

Tom London

Detective with Shiner

Sam Lufkin

Thug

Mary MacLaren

Mrs. Patton

Knox Manning

Narrator (voice)

Bruce Mitchell

Cop

Bud Osborne

Lanton

Fred Parker

Train Conductor

Constantine Romanoff

West

Dick Rush

Cop

Cy Schindell

Darcy

Harry Tenbrook

Vrooner

Anthony Warde

Lefty Brent

Duke York

Martel aka Harry Madison

Bert Young

Biff