In order to achieve his crazy ambition of dominating the universe, Tyrannus unhesitatingly exploits huge amounts of energy from the Algol Crystal Forest to create Cell-Divided Zombies, creatures that only know how to obey Tyrannus' orders and conduct massacres. They undergo three phases of evolution - the primitive phase, the development phase and the maturity phase. Each time they evolve to the next phase, their size and strength increases immensely.