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 to guard the weapons. But the oldest was consumed by Darkness and wanted to possess the weapons to recreate Equestria in his own image. A fight between the brothers broke out and the youngest brother struck the oldest down to the Underworld. A thousand years later, after Princess Twilight's coronation of ruler of Equestria, the skeleton army attacked and fillynapped the Princess. Flash Sentry promise to rescue the princess, but he can not do it alone. With the teaching of Sensei Wu, he along with five others will become ninjas, gather the six weapons of Spinjitzu, rescue the princess, and stop Lord Garmadon.