The planet of Gamilon is the home-world of the Gamilon race. They are a group of aliens that exist in the Star Blazers Universe, that colonized the planet many years in the past. This most unusual planet had two crusts: the true crust, and a thinner upper layer formed by the planets many volcanoes. But the planet was having many problems. The Volcanoes were releasing a large quantity of sulfuric acid, which was contaminating most of the water on the planet, as well as destabilizing the planets crusts. There were quite a few people living on the planet, so there was great concern over the survival of their civilization. This spurred the Gamilons to search for another suitable planet to terraform into one they could live on. Sometime between the year 2190 and 2195, the Gamilons found earth.
A planet that was already having massive geological problems, the destruction of Gamilon was probably speed up by the Star Force's attack in the year 2200. After luring them there, the Star Force turned the tables on the Gamilons by setting of a chain reaction in the volcanoes that destroyed the largest (and maybe only) city on Gamilon.
The Planet eventually caved in on itself shortly before the Gamilons and their leader Desslok left to the original home of the colonists, the Galman Empire. They all witnessed it's final moments aboard their starships before leaving the Magellanic Cloud.