William WindomMajor Rick Graves William WoodsonNarrator (voice) (uncredited) Michael RennieVice Chancellor Pierre Alquist Lin McCarthyCol. Archie Harmon Simon ScottDr. John Slaton Richard O'BrienPolice Sergeant Byron KeithGen. Cullenbine John MilfordSheriff Lou Carver Hal TaggartJuror (uncredited) Ron NymanAlien (uncredited) Dabney ColemanJohn Carter William SargentDr. John Devin Laurence NaismithCyrus Stone Patricia SmithEdna Greely Robert KnappLt. Col. Howell James T. CallahanDr. Harry Mills Dallas MitchellJim Rogers Robert SorrellsStation Attendant J.D. CannonPolice Lt. Ben Holman Alfred RyderRyder (Invader Leader) Douglas HendersonLieutenant Farley Barney PhillipsEmmett Morgen William SmithersNat Greely Allen EmersonLibrary Alien Peter Mark RichmanTom Wiley Robert H. HarrisDr. Stanley Frederickson Linden ChilesDr. Bob Vincent Craig ChudyAlien (uncredited) Joanne LinvilleProf. Pat Reed John ZarembaProfessor Ed Harrison Joel FluellenHomer Warren Lee FarrJustice Department Agent Michael HarrisMail Truck Driver R.G. ArmstrongPolice Capt. Bill Battersea Rayford BarnesAlien Driver Eduard FranzPremier Thor Halvorsen Ted KnightAlien Air Force Major McEvoy Roddy McDowallLloyd Lindstrom Willard SageLieutenant James Jackie KendallProprietress Stuart LancasterSuperintendent Diana Van der VlisEve Doneghan Arthur HillWarren Doneghan Carol Eve RossenSelene Lowell Jonathan GoldsmithKevin Ryan Phillip PineSgt. Hal Corman Robert EmhardtOliver Ames Kathleen WiddoesEllen Woods Jeanette NolanMiss Havergill William BramleyConstable Gabbard Jim HalfertyFred Danielson Andrew DugganGeneral Theodore Beaumont Robert OsterlohCarl Wyeth Rick MurrayParking Attendant James WhitmoreHarry Swain William TalmanColonel Griffith Milton SelzerA.J. Richards Susan StrasbergDiane Oberly Ernest SarracinoLeo Rinaldi Robert DoyleSgt. Walter Ruddell Murray MathesonDr. Reynard Jacqueline MayoSobbing Woman Nancy WickwireEvelyn Bowers Ron StokesAlien at Controls Joseph CampanellaFather Joe Robert Walker Jr.Nick Baxter Lynn LoringMadeline Flagg Joseph V. PerryJoe Bagely Len WaylandDeputy Wallace Mercedes ShirleyWoman Attendant Ralph ThomasDeputy in Charge Strother MartinCharlie Coogan John LuptonMaj. Clifford Banks Andrew J. McIntyreDirector Of Photography Meredith M. NicholsonDirector Of Photography 
