Um Drachen vor Bösewichten zu retten, die ihre Lebenskraft rauben wollen, setzen zwei Jugendliche aus verschiedenen Welten ihre neu entdeckten Ninja-Kräfte ein.
Um den machthungrigen Lord Garmadon aufzuhalten, bildet sein Bruder Sensei Wu im Reich Ninjago vier junge Ninjas aus. Ihnen schließt sich schon bald Garmadons Sohn Lloyd an, der sich als der sagenumwobene grüne Ninja entpuppt. Garmadon versucht vergeblich, die Ausbildung seines Sohnes zu verhindern, und entwickelt immer wieder neue Pläne, um dem Bösen zum Sieg zu verhelfen.
Kim Shin ist ein so genannter Dokkaebi (= Goblin, Dämon, Kobold), dazu verdammt zu leben und sich immer wieder an die von ihm Ermordeten zu erinnern. Erlösen davon, kann ihn nur eine Frau, die ihn liebt, die sogenannte "Braut des Dokkaebi". Auch der Tod (Angel of Death, Gevatter Tod) hat etwas mit der Vergangenheit des Dokkaebi zu tun, wie auch die schöne Besitzerin eines Imbiss. Für sie alle scheint es kein positives Ende zu geben - oder doch?
The story is set a hundred years after a war between the Empire of Snow (Ice Tribe) and the Fire Tribe, where the Fire Tribe was defeated. However, the war was fatal, leaving Prince Ka Suo and his younger half-brother Ying Kong Shi the only royal heirs and pure-blood ice illusionists left in the Ice Tribe. Conflict ensues after Ka Suo reluctantly ascends to the throne as his lover, Li Luo, and his brother go missing. Ka Suo also accidentally discovers an evil presence lurking in the Ice Tribe's holy shrine. He and his companions enter the mysterious shrine, and defeat head of the shrine, Lady Yuan Ji, only to find out that she has been plotting a conspiracy against him. Ka Suo also experiences hardships in trying to find his lover and brother, not knowing that his brother has lost all of his memories and has become the Fire Prince under his mother's command. A war between the two tribes commences once again, with the two brothers pitted against each other.
The Elemental beings known as The Hohki Dawners must team up and find the Elemental cubes in the regions of Xolvadus to reawaken the Goddess of the Ether, Xiarare and defeat Xumis, the Goddess of the Void