An ordinary Lego mini-figure, mistakenly thought to be the extraordinary MasterBuilder, is recruited to join a quest to stop an evil Lego tyrant from conquering the universe.

A cooler-than-ever Bruce Wayne must deal with the usual suspects as they plan to rule Gotham City, while discovering that he has accidentally adopted a teenage orphan who wishes to become his sidekick.

It's been five years since everything was awesome and the citizens are facing a huge new threat: LEGO DUPLO® invaders from outer space, wrecking everything faster than they can rebuild.

Season one (10 episodes) of the show features on aging master Sensei Wu as he struggles to train four young Ninja in the ways of an ancient battle art called Spinjitzu to defeat his evil brother Lord Garmadon, ruler[but not king] of the underworld, and stop him from gaining four golden weapons which would make his power limitless. Though many skeleton characters are introduced, only Kruncha and Nuckal appear in season two, making cameos as substitute teachers.
Season two (13 episodes) focuses on Garmadon's young son Lloyd Garmadon, who, lacking proper fathering, has released an ancient evil army of snakes, who hold unique powers. The four Ninja must stop them from uniting to unleash the Great Devourer, an evil with power to consume the land.