Eighteen years ago, a ROM Hack was released to the public by a japanese creator known as carol. This user would become well known as the person behind a game filled with crossovers of various media based on their interests. "Brutal Mario" would be the English name chosen for a game about the growing darkness corrupting the titular hero "Mario." He sets out for the conquest of Bowser's Kingdom. However, the dark lands are guarded by foes from across various worlds. Meanwhile, the wastelands of the Mushroom Kingdom soon rise once more from the rubble, awaiting the day to end Mario's tyranny.

This ROM hack mixes many universes like Castlevania, Bomber Man, and others.