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. Malcolm Gantley
Bob Torin / Tony LaCava
Guard / Policeman
Prof. Charles McKay / Brother John
Brother James / Gen. Cullenbine
James Boland / Sheriff Lou Carver
Guard / Lt. Rawlings
Deputy / Sergeant
Alien (uncredited) / Juror (uncredited)
Alien (uncredited) / Bartender / Alien (uncredited)
Alien Pilot / Trooper
Mama / Maid
Allen Slater / Dr. Mailer
Man / Joe Manners
Cobbs / Sergeant
Capt. Mitchell Ross / John Carter
Carr / Alien
