Ninjago: Assault on Ninjago City

SYNOPSIS

An expedition led by Misako, Master Wu and Clutch Powers goes missing, prompting the ninja to embark on a rescue mission to a mysterious and uncharted island. When Nya's powers are disrupted by a strange recurring pulse, the ninja undertake a search for answers that leads them to the bottom of the Endless Sea, where they discover Nya's powers are linked to an ancient mythical creature.