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.

Cole, Jay, Kai, and Zane have retired from Spinjitzu and have become teachers at the Youth Academy. But will the rise of a new enemy bring them out of retirement and back into action?

Cole, Jay, Kai, and Lloyd have managed to defeat every opponent they've faced in the Tournament of Elements so far, but now the tournament pits ninja against ninja, and only one can remain.

Under the leadership of Sensei Wu, the Masters of Spinjitzu, joined by a contrite Lord Garmadon and his son Lloyd, travel throughout the world to dismantle the doomsday devices that were set up by Garmadon and timed to activate in the event of his defeat.

After another big fight with Lord Garmadon, the ninja have come together to rebuild the Monastery of Spinjitzu and train with Master Wu. But when a training exercise gone wrong unleashes a group of angry invisible Ninja Squirrels--that's right, angry invisible Ninja Squirrels--the ninja will have to think fast or risk destroying the monastery all over again!

Quiet Zane isn't like the other ninja. His weird humor sometimes gets him in trouble with Cole, Kay, and Kai--especially when he leads the ninja into a mission that ends in the destruction of their home in Sensei Wu's monastery. Now Zane must hope that a new path will rise from the monastery's ashes.

When Lord Garmadon brings back to life the original owners of the ninja's ship, the Destiny's Bounty, the Ninjago must stop the pirates from plundering Ninjago City.

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.

Now that Nya's a full-fledged ninja, she learns that teamwork may be the most powerful force against evil.