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.

"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.

"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...