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Hugh MarloweDr. Russell A. Marvin
Joan TaylorCarol Marvin
Donald CurtisMaj. Huglin
Morris AnkrumBrig. Gen. John Hanley
Thomas Browne HenryVice Adm. Enright
Grandon RhodesGen. Edmunds
John ZarembaProf. Kanter
Paul FreesAlien (voice)
Frank WilcoxAlfred Cassidy
Sydney MasonFrank the garage man
Larry J. BlakeMotorcycle cop
Bert StevensAir Intelligence Command Officer
Forbes MurrayMilitary Officer at Experiment
Arthur ToveyOfficer/Civilian at Military ConferenceAlan WellsMajor Kimberly
Nicky BlairMilitary Officer at Experiment (uncredited)Jimmy CrossMilitary Messenger (uncredited)Jack DeeryMilitary Officer (uncredited)
Charles EvansDr. Alberts (uncredited)Raoul FreemanMilitary Official (uncredited)Paul FreesAlien (voice) (uncredited)James GonzalezMilitary Official (uncredited)Duke GreenMinor Role (uncredited)Ed HaskettMilitary Official (uncredited)
Clark HowatSgt. Nash (uncredited)
Harry LauterCutting - Generator Technician (uncredited)Don MarloweMinor Role (uncredited)William MeaderWorker in Control Tower (uncredited)
Sol MurgiPlane Passenger (uncredited)Forbes MurrayMilitary Officer at Experiment (uncredited)William J. O'BrienRadio Listener (archive footage) (uncredited)Murray PollackPlane Passenger (uncredited)
Mike RaganTank Commander (uncredited)Alan ReynoldsMaj. Kimberly (uncredited)
Dale Van SickelMan Crushed Beneath Wall (uncredited)Guy WayCivilian Observing Saucer Attack (uncredited)Bob WhitneyPlane Passenger (uncredited)Frank WilcoxAlfred Cassidy (uncredited)Beal WongChinese Radio Listener (uncredited)
William WoodsonNarrator (voice) (uncredited)
