In Mini Ninjas the main character is the small ninja, Hiro. Although he has shown great promise, Hiro is the last ninja that anyone would expect to save the world, yet that is exactly what he is called to do when an evil samurai warlord hatches a plan bent on total world domination. In this plan the evil lord attempts to recapture the dominion he held prior to being cast out by creating an army of samurai slaves out of innocent animals. In the process of doing this he also upsets the natural balance of the the world, causing catastrophic storms, something Hiro can not stand for. Armed with authentic ninja weapons and powerful spells, Hiro must rescue the fellow ninjas of his clan who the warlord has captured and then lead them on an exciting journey to battle the magical army of twisted Samurai.