Guest Stars Gary Coleman as Hieronymous Fox Ray Walston as Roderick Zale Earl Boen as Selmar Albert Popwell as Koren Melody Rogers as Lieutenant Dia Cyrton Co Starring Mel Blanc voices Twiki the Robot Felix Silla as Twiki the Robot Tony Epper as Drunk Lester C. Fletcher as M.D. Toman Tobar Mayo as Guard Uncredited Eric Server voices Dr. Theopolis