Frank Parker

as Harter

as Minister

as Captain

as Technician #2

as Zed

as Bill

as Clifford

as Jerry Wade

as Commander

as Lane Curran

as Tom Brown

as Ed

as Dan Daubrey

as College Professor

as Otis Berne

as Hardin

as Sheriff Thornton

as Iceman

as Father Jeremy Hogan

as Deputy Sheriff Hank Matson (as Brett Parker)

as Vic Hancock

as Roche

as Countdown Technician

as Engineer (uncredited)

as Hans - Officer #2 (uncredited)