Dr. Russell A. Marvin

Hugh Marlowe

Acting

Carol Marvin

Joan Taylor

Acting

Maj. Huglin

Donald Curtis

Acting

Brig. Gen. John Hanley

Morris Ankrum

Acting

Vice Adm. Enright

Thomas Browne Henry

Acting

Gen. Edmunds

Grandon Rhodes

Acting

Prof. Kanter

John Zaremba

Acting

Alien (voice)

Paul Frees

Acting

Alfred Cassidy

Frank Wilcox

Acting

Frank the garage man

Sydney Mason

Acting

Motorcycle cop

Larry J. Blake

Acting

Air Intelligence Command Officer

Bert Stevens

Acting

Military Officer at Experiment

Forbes Murray

Acting

Officer/Civilian at Military Conference

Arthur Tovey

Acting

Major Kimberly

Alan Wells

Acting

Military Officer at Experiment (uncredited)

Nicky Blair

Acting

Military Messenger (uncredited)

Jimmy Cross

Acting

Military Officer (uncredited)

Jack Deery

Acting

Dr. Alberts (uncredited)

Charles Evans

Acting

Military Official (uncredited)

Raoul Freeman

Acting

Alien (voice) (uncredited)

Paul Frees

Acting

Military Official (uncredited)

James Gonzalez

Acting

Minor Role (uncredited)

Duke Green

Acting

Military Official (uncredited)

Ed Haskett

Acting

Sgt. Nash (uncredited)

Clark Howat

Acting

Cutting - Generator Technician (uncredited)

Harry Lauter

Acting

Minor Role (uncredited)

Don Marlowe

Acting

Worker in Control Tower (uncredited)

William Meader

Acting

Plane Passenger (uncredited)

Sol Murgi

Acting

Military Officer at Experiment (uncredited)

Forbes Murray

Acting

Radio Listener (archive footage) (uncredited)

William J. O'Brien

Acting

Plane Passenger (uncredited)

Murray Pollack

Acting

Tank Commander (uncredited)

Mike Ragan

Acting

Maj. Kimberly (uncredited)

Alan Reynolds

Acting

Man Crushed Beneath Wall (uncredited)

Dale Van Sickel

Acting

Civilian Observing Saucer Attack (uncredited)

Guy Way

Acting

Plane Passenger (uncredited)

Bob Whitney

Acting

Alfred Cassidy (uncredited)

Frank Wilcox

Acting

Chinese Radio Listener (uncredited)

Beal Wong

Acting

Narrator (voice) (uncredited)

William Woodson

Acting