Actors

Actor

Dr. Russell A. Marvin

Actor

Carol Marvin

Actor

Maj. Huglin

Actor

Brig. Gen. John Hanley

Actor

Vice Adm. Enright

Actor

Gen. Edmunds

Actor

Prof. Kanter

Actor

Alien (voice)

Actor

Alfred Cassidy

Actor

Frank the garage man

Actor

Motorcycle cop

Actor

Air Intelligence Command Officer

Actor

Military Officer at Experiment

Actor

Officer/Civilian at Military Conference

Actor

Major Kimberly

Actor

Military Officer at Experiment (uncredited)

Actor

Military Messenger (uncredited)

Actor

Military Officer (uncredited)

Actor

Dr. Alberts (uncredited)

Actor

Military Official (uncredited)