Warren Hull

Mandrake the Magician

Doris Weston

Betty Houston

Al Kikume

Lothar

Rex Downing

Tommy Houston

Edward Earle

Dr. Andre Bennett

Forbes Murray

Professor Houston

Kenneth MacDonald

James Webster

Don Beddoe

Frank Raymond

Dick Curtis

Dorgan

John Tyrrell

Dirk

Stanley Brown

Green

Beatrice Curtis

Rest Home Nurse

Robert Sterling

Henchman

Sam Ash

George Regan

Lester Dorr

Gray

Ernie Adams

Brown

Eddie Fetherston

Rest Home Henchman

Eddie Foster

Ed

Knox Manning

Narrator

Ernie Alexander

Cabbie

Harry Bernard

Construction Camp Watchman

Stanley Blystone

Henchman CX12

Buel Bryant

Rest Home & Ironworks Henchman

Budd Buster

Construction Camp Henchman

George Chesebro

Baker

Charles Dorety

Mill River Inn Henchman

Jerry Frank

Harper Drive Henchman

Kit Guard

Powerhouse Henchman

Frank Hagney

Harris

Chuck Hamilton

Bank Henchman

Eddie Hart

Williams

Oscar 'Dutch' Hendrian

Powerhouse Henchman

Jerry Jerome

Ward

Eddie Laughton

Kidnapping Henchman

Tom London

Mill River Inn Henchman

Stanley Mack

Roadster Henchman

Pat McKee

Dam Henchman

Charles McMurphy

Construction Foreman

Frank Mills

Gas Station Hitman

Art Mix

Ironworks Henchman

Eddie Parker

Henchman

Ralph Peters

Mohawk Steward-Henchman

Rose Plumer

Ship Passenger

Cyril Ring

Magic Mart Henchman

Cy Schindell

Bank Henchman

Charles Sherlock

Ship Henchman

Reginald Simpson

Parsons

Tom Steele

Powerhouse Henchman

Charles Sullivan

Henchman-Driver

Harry Tenbrook

Streeter

George Turner

Apartment-Raider

Frank Wayne

Henchman

Blackie Whiteford

Construction Camp Henchman

Bud Wolfe

Tower Henchman

Bert Young

Rest Home Henchman

Steve Clark

Henchman (uncredited)