Following the extinction of the Spiral Warriors at the hands of the Anti-Spirals, Lordgenome retreated to Earth and recommissioned his Beastmen to act as population control. Piloting towering Gunmen, the Beastmen patrolled the planet's surface and used their superior technology to kill any human who trespassed above ground, preventing the human population from ever growing large enough to be detected by the Anti-Spirals. Lordgenome divided his forces into the four branches of the "Human Eradication Army", each led by one of his four "Supreme Generals", responsible for monitoring a distinct cardinal direction of the planet's surface. Each of the four "Supreme Generals" is a representation of one of the four classical elements: earth, air, fire and water.