With darkness encroaching on the island of Mata Nui, the only hope for the survival of the islanders rests with two Matoran villagers, who must find the seventh Toa and deliver to him the fabled Mask of Light.

In the time before time, six unlikely Matoran find themselves transformed into mighty Toa. The new Toa Metru must prove themselves as true heroes, find the missing Toa Lhikan, and uncover a plot that threatens the heart of Metru Nui.

The Toa Metru return to their glorious city of Metru Nui to finally accomplish their mission, only to find the city in ruins, overrun by the dreaded Visorak horde. Captured by their new enemy and transformed into hideous Toa Hordika, our heroes must find a figure out of myth to be cured of their mutations and fulfill their destiny before the beast within overtakes them.

Once the ruler of an entire universe, the Great Spirit Mata Nui finds himself cast out of his own body, his spirit trapped inside the fabled Mask of Life, hurtling through space. After landing on the far-away planet of Bara Magna, the mask creates a new body for Mata Nui, who unwillingly gets caught up in the furious battles of the nearly barren and dangerous planet.