The Destruction of Macaroni au Gratin
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.
Aired 19/02/1981EP 108 - The Destruction of Macaroni au Gratin

Galaxy Express 999
After witnessing the death of his mother and being left for dead at the hands of Count Mecha, ten-year old Tetsuro Hoshino is awakened by a mysterious woman, Maetal. In exchange for only his company, Maetal offers him the ride of his life on the Galaxy Express 999. It is said that those who travel aboard the legendary train to the end of the line can receive a free mechanical body and with it, immortality.
Impoverished and alone, Tetsuro leaps at the opportunity and joins Maetal on a quest that will span the cosmos. As the Galaxy Express 999 makes its way across our solar system and beyond, Tetsuro is drawn deeper into a dangerous universe where peril lurks at every stop.
(Source: Discotek)