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