Full Credits
32 members

Louis Hayward
Philip 'Scotty' Grayson

Dennis O'Keefe
Daniel F. O'Hara

Louise Allbritton
Dr. Anastasia 'Toni' Neva

Carl Esmond
Dr. Ritter von Stolb

Onslow Stevens
Igor Braun

Raymond Burr
Krebs

Art Baker
Dr. Frederick Townsend

Lowell Gilmore
Dr. William Forrest

Philip Van Zandt
Anton Radchek

Charles Evans
Dr. Homer Allen

Frank Ferguson
Carl Bemish

Reed Hadley
Narrator (voice)

Ray Teal
Police Sergeant

William Tannen
FBI Chemist

Gale Storm
Voice on Tape Recorder

Arthur Space
Mr. North

Tamara Shayne
Mrs. Ecko, the Landlady

Keith Richards
FBI Agent Miller

Grandon Rhodes
Adolph Mizner

Steve Pendleton
Police Detective Gaines

Howard Negley
Feodore

Jimmy Lloyd
FBI Agent Alison

Myron Healey
FBI Agent Thompson

John Hamilton
G.W. Hunter

Paul Bryar
Fred Coby
Bert Davidson

Marten Lamont

Lee Phelps

Suzanne Ridgway

Arthur Tovey

Crane Whitley
20 members
Gordon Douglas
Director
Ridgeway Callow
Assistant Director
Dorothy B. Cormack
Script Supervisor
George Bruce
Screenplay
Bertram Millhauser
Story
Grant Whytock
Producer
Edward Small
Producer
Joseph Small
Unit Manager
George Robinson
Director of Photography
William Dalton
Grip
Edward Colman
Camera Operator
Ken Lobben
Still Photographer
John R. Carter
Sound
Paul Sawtell
Original Music Composer
Rudolph Sternad
Art Direction
Howard Bristol
Set Decoration
Norbert A. Myles
Makeup Artist
Edward P. Lambert
Wardrobe Supervisor
Margaret Martin
Hairstylist
James E. Newcom
Editor