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