Six ordinary Matoran are chosen to become Toa, guardians of the legendary city of Metru Nui. But as they accustom to their new role, conflicts quickly arise between them, and a sinister plot is set in motion right under their noses.

Narmoto tells some young Okotans the story of Makuta's Betrayal, the arrival of the Toa, the reawakening of Ekimu, and the defeat of Kulta This episode is a quick synopsis of the 2015 Online Animations.

In the last episode, the Toa forged new partnerships with the creatures of the elements. And now when the Toa and their Creatures unify...the Toa experience incredible mastery of their elements. But the coming challenge will demand more than just the power of the elements. Just as Ekimu needed his mask of Creation to realize his destiny, his brother Makuta needs his own mask of control before he can awaken and lay claim to the Mask of Ultimate Power....

The Toa and Ekimu chase the Destroyer across Okoto, trying to undo the damage he has done as he travels. They catch him at the shores of Black Bay, using the combined power of the elements to raise the legendary Black Volcano. It is here that we first see the massive doors that lead to the underworld...and the tomb of Makuta. As the Toa attack the Destroyer, he holds them off while trying to force open enormous doors. All the power of the elements...