Kai promises to watch over Lloyd when Lloyd fears the loss of his father will make the path ahead uncertain- but when Wu sends them out on an errand for his new Tea Farm, Lloyd goes on a solo mission... only to discover it's a trap from a Ghost who's escaped the Cursed Realm.

When Moro gives chase to the Bounty and steals Wu's staff, Wu shares the story of Moro: the boy who wanted to be the Green Ninja - and the Ninja discover Wu's staff contained 3 symbols that lead to the Tomb of the First Spinjitzu Master which holds a mysterious relic that could alter the course of Ninjago.

The Ninja travel to the Village of Stiix to find the thief who stole the scroll of Airjitzu, but the self-serving Ronan isn't keen to sell it cheaply so the Ninja must figure out a way to make money on the docks - and when they fail to make enough cash, the Ninja decide to steal it - but have a run in with Moro and Sowlarcha.

After losing the scroll to Morro, the ninja finds a new way to learn Airjitzu, from the ghost of Sensei Yang in his haunted temple. Nya, meanwhile, is doubting her potential as the Water ninja, so Ronin takes her to her Samurai cave, but there is a nasty surprise waiting for them.

Now that the ninja knows Airjitzu, they get prepared to hunt for the second clue to the tomb. They must embark to Cloud Kingdom and retrieve the Sword of Sanctuary. It's a race against Morro and his ghostly allies to get to Cloud Kingdom before the gateway passes.

In Cloud Kingdom, a realm where destinies are written, the Ninja must get the Sword of Sanctuary, a powerful relic that can see past the traps surrounding the tomb of the First Spinjitzu Master - but tensions are high as Moro's escape from the Cursed Realm has put the future in chaos, and they won't give the Sword to the Ninja unless the Master Writer meets them personally.

The Ninja now have all the items they need to get to the tomb of the First Spinjitzu Master but before they can figure out the last riddle that leads to the location of the tomb, Ronan steals the sword to give to Moro in exchange for his soul, and the Ninja and Nya are unable to stop him.

The Ninja use Ronan's airship to travel to the tomb of the First Spinjitzu Master, in an underwater cave, only to find out Moro is already there - and the Ninja must traverse the temple traps without the aid of the Sword of Sanctuary in a desperate attempt to get to the tomb first.

Morro, with the realm crystal, has opened a portal to the Cursed Realm and ghosts have taken over the City of Stiix. The ninja team go undercover to infiltrate the city and get Lloyd to the crystal before Morro's new master can arrive.

Lloyd is now trapped in the Cursed Realm and the Preeminent has arrived in Ninjago. Now it's up to the remaining ninja to stop the Preeminent from cursing Ninjago, but her army of ghosts isn't making it easy.