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