A Invasão dos Discos Voadores
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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 (voz) (sem créditos)
Frank WilcoxAlfred Cassidy (sem créditos)- Sydney MasonFrank the garage man
Larry J. BlakeMotorcycle cop
Bert StevensAir Intelligence Command Officer
Forbes MurrayMilitary Officer at Experiment (sem créditos)
Arthur ToveyOfficer/Civilian at Military Conference- Alan WellsMajor Kimberly
Nicky BlairMilitary Officer at Experiment (sem créditos)- Jimmy CrossMilitary Messenger (sem créditos)
- Jack DeeryMilitary Officer (sem créditos)
Charles EvansDr. Alberts (sem créditos)- Raoul FreemanMilitary Official (sem créditos)
- James GonzalezMilitary Official (sem créditos)
- Duke GreenMinor Role (sem créditos)
- Ed HaskettMilitary Official (sem créditos)
Clark HowatSgt. Nash (sem créditos)
Harry LauterCutting - Generator Technician (sem créditos)- Don MarloweMinor Role (sem créditos)
- William MeaderWorker in Control Tower (sem créditos)
Sol MurgiPlane Passenger (sem créditos)- William J. O'BrienRadio Listener (imagens de arquivo) (sem créditos)
- Murray PollackPlane Passenger (sem créditos)
Mike RaganTank Commander (sem créditos)- Alan ReynoldsMaj. Kimberly (sem créditos)
Dale Van SickelMan Crushed Beneath Wall (sem créditos)- Guy WayCivilian Observing Saucer Attack (sem créditos)
- Bob WhitneyPlane Passenger (sem créditos)
- Beal WongChinese Radio Listener (sem créditos)
William WoodsonNarrator (voz) (sem créditos)