LEGO Ninjago - Way of the Ninja (2011)

The first Ninjago pilot, introducing the ninja and showcasing their initial training with Wu to stop Garmadon from becoming a physical being. When Nya, the sister of a blacksmith called Kai, is kidnapped by skeletons working for the evil Lord Garmadon, Kai goes under training from a Sensei called Wu, the son of the First Spinjitsu Master and brother to Lord Garmadon, along side 3 others - Jay, Cole, and Zane - to rescue Nya and become the four Elemental Masters.