Way of the Ninjago (Lego Ninjago)

Kai's only dream is to master his father's blacksmith craft. Until the day an army of skeleton warriors raids his villages and kidnaps his siter, Nya. Kai's only hope of rescuing his sister lies with Sensei Wu, a mysterious old man with a mission. Sensei Wu promises to teach Kai Spinjitzu. Will it be enough to save Nya?