After flying through an electrical storm, ninja Jay crash-lands in an alternate world where Sensei Wu never taught the ninjas the art of spinjitzu and the Serpentine rule with skeleton warriors as their servants.
Cole, Zane, Jay, and Kai try to defeat a foe who can control the mind. One of them actually does fall under the spell of the Hypnobrai and the question for the rest is how will the fellow ninja react?
Under the leadership of Sensei Wu, the Masters of Spinjitzu, joined by a contrite Lord Garmadon and his son Lloyd, travel throughout the world to dismantle the doomsday devices that were set up by Garmadon and timed to activate in the event of his defeat.