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
Brother John / Prof. Charles McKay
Air Crash Investigator / Brother James
Jim Bryce / James Boland
Lt. Rawlings / Guard
Deputy / Sergeant
Juror (uncredited) / Pedestrian (uncredited)
Alien (uncredited) / Bartender / Alien (uncredited)
Alien Pilot / Trooper
Mama / Maid
Allen Slater / Dr. Mailer
Man / Joe Manners
Sergeant / Cobbs
Capt. Mitchell Ross / John Carter
Alien / Carr
