After destroying the Cursed Realm and saving Ninjago, the Ninja have discovered new-found fame; a new evil named Nadakhan the Djinn is freed and a new age of piracy has begun.

The Ninja must find out as much as they can about Nadakhan before he finds the Realm Crystal to save his crew; the Ninja are labeled enemies by the world they used to protect and find themselves hunted by their old friend Ronin.

Falsely imprisoned and at their lowest point, the Ninja find an unlikely friend in an old enemy; Nadakhan rescues his marooned crew and gains a new perspective.

As the ninjas deal with their fame after the destruction of the Cursed Realm, the fate of their world once again comes under threat when sky pirates attack.