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