Planet Bomber

From the Super Mario Wiki

Bomber is the home planet of the hero Bomberman and the Bomberman species. This world was the setting of the game Wario Blast: Featuring Bomberman! Strangely, Wario somehow stumbled upon this unsuspecting planet during his lifetime. Upon entering the world, the greedy character wanted to make the planet's riches his own. Wario, along with an army of False Warios, attempted to loot Bomber; however, their efforts were stopped by Bomberman and an army of Bombermen. In the end, Wario was expelled back to Mushroom World, and Planet Bomber returned to peace.