David Vincent
Stan Arthur / Edgar Scoville
Major Rick Graves / Michael Tressider
Sherri Vikor / Ellie Markham
Narrator (voice) (uncredited)
Vice Chancellor Pierre Alquist / Magnus
Col. Archie Harmon / Fellows
Dr. John Slaton / Maj. Pete Stanhope
Bob Torin / Tony LaCava
Guard / Policeman
Police Sergeant / Prof. Charles McKay
Air Crash Investigator / Gen. Cullenbine
Sheriff Lou Carver / Jim Bryce
Guard / Reporter
Deputy / Sergeant
Alien (uncredited) / Juror (uncredited)
Alien (uncredited) / Bartender / Alien (uncredited)
Alien Pilot / Trooper
Mama / Maid
Allen Slater / Dr. Mailer
Joe Manners / Man
Sergeant / Cobbs
John Carter / Capt. Mitchell Ross
Alien / Carr
