Réalisation: Fred F. Sears
Pendant les années 50 les apparitions d'objets volants non identifés se multiplient à travers le monde. Un jour, alors qu'ils circulent en voiture pour se rendre à la base ou ils travaillent sur un projet de lancement de fusées d'observation, le docteur Russel A.Marvin et sa jeune épouse Carol sont survolés à leur tour par une soucoupe volante qui finit par disparaître.
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
Paul Frees
Alien (voice)
Frank Wilcox
Alfred Cassidy
Sydney Mason
Frank the garage man
Larry J. Blake
Motorcycle cop
Bert Stevens
Air Intelligence Command Officer
Forbes Murray
Military Officer at Experiment
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)
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
Paul Frees
Alien (voice)
Frank Wilcox
Alfred Cassidy
Sydney Mason
Frank the garage man
Larry J. Blake
Motorcycle cop
Bert Stevens
Air Intelligence Command Officer
Forbes Murray
Military Officer at Experiment
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)
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
Paul Frees
Alien (voice)
Frank Wilcox
Alfred Cassidy
Sydney Mason
Frank the garage man
Larry J. Blake
Motorcycle cop
Bert Stevens
Air Intelligence Command Officer
Forbes Murray
Military Officer at Experiment
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)