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.

Under the tutelage of Sensei Wu, the "chosen four" ninjas Kai, Jay, Cole, and Zane must use their elemental powers to defeat Sensei Wu's evil brother, Garmadon, and Samukai's army of skeleton warriors before Garmadon can conquer the world. -- provided by publisher.

With their sensei by their side, the Ninjago masters of spinjitsu go to the Underworld and face Lord Garmadon to obtain the final golden weapon.

After flying through an electrical storm, ninja Jay crash-lands in an alternate world where Sensei Wu never taught the ninjas the art of spinjitzu and the Serpentine rule with skeleton warriors as their servants.

"Sensei Wu has sent Cole, Jay, Kai, and Zane on their first mission. The four Ninjago warriors must recover the Scythe of Quakes, one of the Four Golden Weapons, before they can go head-to-head with Lord Garmadon. But Kai has his own ideas about how to recover the Weapon. Can Cole, Jay, and Zane convince him they're all playing for the same team?"--P. 4 of cover.

Cole, Zane, Jay, and Kai try to defeat a foe who can control the mind. One of them actually does fall under the spell of the Hypnobrai and the question for the rest is how will the fellow ninja react?

Rise of the snakes: Just when it seemed peace was at hand in the land of Ninjago, a new evil has arisen! Lloyd Garmadon, the son of Lord Garmadon, has woken the Serpentine, a race of snake-headed beasts who've been banished for centuries. It's up to Cole, Jay, Kai, and Zane to face this new challenge with their trademark humorous, kick-butt attitude. A ninja's path: Quiet Zane isn't like the other ninja. His weird humor sometimes gets him in trouble...

Discovering the secret nest of the evil Fangpyres, Cole and his ninja team learn unexpected and shocking secrets about the Serpentine.

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.