A grieving Lloyd is possessed by the ghost of Morro – the Master of Wind and Wu’s first student. In Lloyd’s body, Morro renders the other ninja powerless before stealing Wu’s staff. It contains three hidden symbols, the path to finding the Tomb of First Spinjitzu Master. Wu knows that if Morro finds the tomb, he will claim the Realm Crystal. This relic has the power to open the fabric between realms, enabling the powerful Preeminent to enter the NINJAGO world.The remaining ninja follow the clues to Yang’s Haunted Temple and learn the ancient art of aerial combat, Airjitzu. There disaster strikes. Warned to leave the Temple by sunrise, Cole waits too long and is transformed into a ghost! Then they scale the Wailing Alps to retrieve the Sword of Sanctuary from the Cloud Kingdom, only for Ronin to steal the weapon at the last moment. Meanwhile Nya discovers her mother was a Master of Water and struggles to unlock her own True Potential.Finally, they reach the Tomb of the First Spinjitzu Master, saving Lloyd and restoring their powers. But Morro escapes with the Realm Crystal and all the ninja can do is prepare for the Preeminent’s arrival.In the City of Stixx, Lloyd is pulled into the Cursed Realm by Morro and there Lloyd meets his father. Garmadon tells him that the Preeminent IS the Cursed Realm and must be defeated to save the NINJAGO world. With a heavy heart Lloyd pursues Morro across the realms and finally tricks the ghost into destroying himself. At the same time, the ninja confront the Preeminent, just as Nya unlocks her True Potential. She creates a tidal wave with her new Water Power, toppling the entity into the sea and drowning it. Master Wu uses the Realm Crystal to bring Lloyd back and the ninja celebrate their victory.