Hugh Marlowe

Dr. Russell A. Marvin

Joan Taylor

Carol Marvin

Donald Curtis

Maj. Huglin

Morris Ankrum

Brig. Gen. John Hanley

Thomas Browne Henry

Vice Adm. Enright

Grandon Rhodes

Gen. Edmunds

John Zaremba

Prof. Kanter

Fred Aldrich

Sydney Mason

Frank the garage man

Larry J. Blake

Motorcycle cop

Bert Stevens

Air Intelligence Command Officer

Arthur Tovey

Officer/Civilian at Military Conference

Alan Wells

Major Kimberly

Nicky Blair

Military Officer at Experiment (uncredited)

Jimmy Cross

Military Messenger (uncredited)

Jack Deery

Military Officer (uncredited)

Charles Evans

Dr. Alberts (uncredited)

Raoul Freeman

Military Official (uncredited)

Paul Frees

Alien (voice) (uncredited)

James Gonzalez

Military Official (uncredited)

Duke Green

Minor Role (uncredited)

Ed Haskett

Military Official (uncredited)

Clark Howat

Sgt. Nash (uncredited)

Harry Lauter

Cutting - Generator Technician (uncredited)

Don Marlowe

Minor Role (uncredited)

William Meader

Worker in Control Tower (uncredited)

Sol Murgi

Plane Passenger (uncredited)

Forbes Murray

Military Officer at Experiment (uncredited)

William J. O'Brien

Radio Listener (archive footage) (uncredited)

Murray Pollack

Plane Passenger (uncredited)

Mike Ragan

Tank Commander (uncredited)

Alan Reynolds

Maj. Kimberly (uncredited)

Dale Van Sickel

Man Crushed Beneath Wall (uncredited)

Guy Way

Civilian Observing Saucer Attack (uncredited)

Bob Whitney

Plane Passenger (uncredited)

Frank Wilcox

Alfred Cassidy (uncredited)

Beal Wong

Chinese Radio Listener (uncredited)

William Woodson

Narrator (voice) (uncredited)

Fred F. Sears

Director

Gene Anderson Jr.

Asistente de Dirección

Bernard Gordon

Guión, Guión Adaptado

George Worthing Yates

Guión, Guión Adaptado

Curt Siodmak

Guión, Screenstory

Donald E. Keyhoe

Novela

Fred Jackman Jr.

Director de Fotografía

Mischa Bakaleinikoff

Compositor de la Música Original

J.S. Westmoreland

Sound

Charles H. Schneer

Productor

Columbia Pictures

Compañía de Produccion

Sam Katzman

Productor Ejecutivo

Jack Erickson

Production Coordinator

Leon Chooluck

Unit Manager

Danny B. Landres

Editor

Paul Palmentola

Dirección Artística

Sidney Clifford

Decorados

Ray Harryhausen

Visual Effects

Russ Kelley

Special Effects