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