Dr. Russell A. Marvin

Carol Marvin

Maj. Huglin

Brig. Gen. John Hanley

Vice Adm. Enright

Gen. Edmunds

Prof. Kanter

Alien (voice)

Alfred Cassidy

Frank the garage man

Motorcycle cop

Air Intelligence Command Officer

Military Officer at Experiment

Officer/Civilian at Military Conference

Major Kimberly

Military Officer at Experiment (uncredited)

Military Messenger (uncredited)

Military Officer (uncredited)

Dr. Alberts (uncredited)

Military Official (uncredited)

Alien (voice) (uncredited)

Military Official (uncredited)

Minor Role (uncredited)

Military Official (uncredited)

Sgt. Nash (uncredited)

Cutting - Generator Technician (uncredited)

Minor Role (uncredited)

Worker in Control Tower (uncredited)

Plane Passenger (uncredited)

Military Officer at Experiment (uncredited)

Radio Listener (archive footage) (uncredited)

Plane Passenger (uncredited)

Tank Commander (uncredited)

Maj. Kimberly (uncredited)

Man Crushed Beneath Wall (uncredited)

Civilian Observing Saucer Attack (uncredited)

Plane Passenger (uncredited)

Alfred Cassidy (uncredited)

Chinese Radio Listener (uncredited)

Narrator (voice) (uncredited)

Directing

Writing

Writing

Writing

Writing

Visual Effects

Camera

Art

Editing

Art

Directing

Crew

Sound

Crew

Production

Production

Production