Long before time had a name, the first Spinjitzu master created Equestria using six golden elemental weapons. When he passed, he left his two sons and daughters to protect these Golden Weapons. But the oldest son was consumed by Darkness and wanted to possess the weapons to recreate Equestria in his own dark image. An earthshattering battle fight between the siblings broke out and the oldest was struck down and banished to the Underworld but not before infecting the younger sister with his darkness. A thousand years later, after Princess Twilight's coronation of ruler of Equestria, the skeleton army attacked and kidnip the Princess. Flash Sentry, a promising you guard, vowed to rescue the princess, but he can not do it alone. With the teaching of Sensei Wu, he along with five others will become ninja, gather the six weapons of Spinjitzu, rescue the princess, and stop Lord Garmadon.