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
Maj. Pete Stanhope / Dr. John Slaton
Bob Torin / Tony LaCava
Guard / Policeman
Brother John / Prof. Charles McKay
Air Crash Investigator / Brother James
James Boland / Jim Bryce
Lt. Rawlings / Reporter
Deputy / Sergeant
Juror (uncredited) / Alien (uncredited)
Alien (uncredited) / Bartender / Alien (uncredited)
Trooper / Alien Pilot
Maid / Mama
Dr. Mailer / Allen Slater
Joe Manners / Man
Cobbs / Sergeant
Capt. Mitchell Ross / John Carter
Alien / Carr
