The Planet of Macaroni au Gratin, so called after its shape, was the next destination of the 999. Mane and Sab, the mechanical Dendorium brothers, who were bored with playing war games at the expense of the planet, captured (and shrunk) Maetel and Tetsuro so that they could escape the planet with the 999. They feigned a total war that destroyed the planet, but Queen Promethium (Maetel's mother) appeared and brought them to the train. Mother Computer Junior, discovered their escape and had them executed, while restoring Tetsuro and Maetel to their original size. (thetvdb.com)