After another battle with the forces of Kulta, the Toa receive new masks and armor from Ekimu, and thus go from being Masters to Uniters of the elements. Following a final clash with the Skull Creatures, they set out to find the Elemental Creatures, who hid Makuta's Mask of Control after his long ago defeat. Each eventually finds and bonds with their Elemental Creature, though Lewa is menaced by Makuta's ally Umarak, a deadly hunter. Having learned the mask's location on an island labyrinth, the Toa travel there, but Umarak takes advantage of Pohatu's dislike for his creature to claim the Mask. Makuta then uses the mask to transform Umarak into the monstrous Destroyer, and sets him to recovering the fragments of the Mask of Ultimate Power while the Lava Beasts, Quake Beasts, and Storm Beasts attack the ancient city.