When the ninja receive an invitation to partake in the Tournament of Elements and a clue that Zane might be alive, they accept and travel to a lost island owned by notorious crime lord Master Chen in order to save their friend.
Chen entices the contestants to hunt down Nya while Lloyd discover's Chen's plan to steal everyone's power so that he can complete a spell and turn his worshipers into Anacondrai, bringing the return of the Serpentine War.
Chen only needs Lloyd's powers to complete the spell and tries to enlist the Fire Ninja by promising to share secrets about his parents. All the while, Lloyd tries to rescue the Ninja, pitting him in a showdown with Chen.
With the elemental alliance scattered across Ninjago and Chen having discovered how to make the spell permanent, the balance is at risk as Garmadon makes his last stand against evil at the corridor of elders.