William WindomMajor Rick Graves William WoodsonNarrator (voice) (uncredited) Michael RennieVice Chancellor Pierre Alquist Lin McCarthyCol. Archie Harmon Simon ScottMaj. Pete Stanhope Richard O'BrienProf. Charles McKay Hal TaggartPedestrian (uncredited) Ron NymanAlien (uncredited) Dabney ColemanJohn Carter William SargentDr. John Devin Laurence NaismithCyrus Stone Patricia SmithSally Palay Robert KnappCongressman Joe Bonning James T. CallahanEd Gidney Lew BrownNon-Com in Charge Dallas MitchellJim Rogers Robert SorrellsStation Attendant James DalyGen. Samuel Arlington Concannon Alfred RyderRyder (Invader Leader) Ford RaineyGen. Jonathan Blaine Barney PhillipsEmmett Morgen Mary JacksonHattie Willis Suzanne PleshetteAnne Gibbs William SmithersAdam Lane Katherine JusticeJanet Garner Allen EmersonLibrary Alien Peter Mark RichmanAndrew Hatcher Robert H. HarrisDr. Stanley Frederickson Craig ChudyAlien (uncredited) Joanne LinvilleProf. Pat Reed John ZarembaProfessor Ed Harrison Ross ElliottProf. Eliot Kramer Joel FluellenHomer Warren Lee FarrJustice Department Agent Michael HarrisMail Truck Driver Paul ComiPolice Sgt. Leeds R.G. ArmstrongPolice Capt. Bill Battersea Rayford BarnesAlien Driver Eduard FranzPremier Thor Halvorsen Ted KnightAlien Air Force Major McEvoy Dan FrazerReporter (uncredited) 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 
