Buck isn't the only 20th century human to survive into the future: a small boy named Hieronymus Fox (Gary Coleman) is a genius from Buck's time. The eleven-year-old child's brilliance makes him the popular ruler of the planet Genesia, until he is kidnapped by Roderick Zale (Ray Walston) and is threatened with death unless his planet pays a heavy ransom - a huge sum that Genesia cannot hope to raise. Fox's bodyguard, Lt. Dia Cyrton (Melody Rogers), having escaped capture, enlists the aid of Buck and Wilma to save her planet's valued leader, whose inhabitants cannot do without.