When Zane, the non-human member of the Spinjitzu team, is asked to join the nindroid ranks, he must decide if he will betray his friends.

The Masters of Spinjitzu are stuck on a comet, having traveled through space to save the World of Ninjago from the Nindroids. As they race through the stars, it becomes apparent that they are not alone on the comet. Something has stowed away, something not of their world.

Master Wu and the Ninjago journey to Dark Island, where an imbalance between good and evil is growing, and the ninja will have to use their mastery over the elements to stop the end of the world.