Special Guest Stars Jack Palance as Kaleel Buster Crabbe as Brigadier Gordon Guest Stars David Groh as Major Duke Danton Roddy McDowall as Governor Saroyan Macdonald Carey as Dr. Mallory Brianne Leary as Ryma Michael Mullins as Regis Saroyan Karen Carlson as Stella Warden Co Starring Mel Blanc voices Twiki the Robot Felix Silla as Twiki the Robot Robert Dowdell as Galen Don Marshall as Julio Don Maxwell as Guard Michael Masters as Worker Borah Silver as Husband June Whitley Taylor as Woman Sheila Wills as Major Fields Diane Markoff as Female Pilot Uncredited Eric Server voices Dr. Theopolis