Kai, a member of Sensei Wu's team of ninja warriors, helps Zane try to find answers about the past and finds himself in danger.

Zane, a member of Sensei Wu's team of ninja warriors who has no memories, wants to find answers about his past, but getting them might put the whole team in danger.

With their sensei by their side, the ninjas go to the Underworld and face Lord Garmadon to obtain the final golden weapon.

Cole, Zane, Jay, and Kai must defeat their teacher Sensei Wu.

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.

"Ever since Lord Garmadon retreated to the underworld, peace has spread throughout the land of Ninjago. But now there is a new threat -- Lloyd Garmadon, Lord Garmadon's son! At first, Cole, Jay, Kai, and Zane don't take Lloyd seriously. After all his main goal is stealing candy from villagers. But all that changes when Lloyd accidentally awakens the Serpentine, a race of powerful snake-headed beasts who've been banished for centuries. Can the four...

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.

Pirates vs. Ninka -- 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. Green Ninja -- When Lord Garmadon uses his mega weapon to turn back the clock and bring an ancient monster back to life, the Ninjago try to stop him, but end up being turned into children instead.