The program follows the adventures of three mutant superhero-refugees from the "Akuma Clan" ("Devil Clan", in English), a vast empire that exists below the surface of the Earth, and their efforts to stop the Akumas from attacking the surface world. The three warriors are Xavitan, a half-demon swordsman, Evil, a somewhat vain and foppish sharpshooter, and Gabra, a slow- and dim-witted strongman. Together, they make up the superheroic team of the show's title. At the end of the series, the heroes' bodies are destroyed, but their souls survive to be reincarnated in the direct sequel to the show, Choujin Bibyun