Lenge før tiden fikk sitt navn ble NINJAGO verdenen skapt av den første Spinjitzu-mesteren ved hjelp av Spinjitzuens fire gylne våpen. Disse våpnene var så mektige at ingen kunne mestre deres samlede krefter på egen hånd. Da Spinjitzu-mesteren døde, avga hans to sønner et løfte om å beskytte våpnene, men eldstesønnen, Lord Garmadon, ble oppslukt av mørket og ønsket å ha alle for seg selv. Det endte med kamp mellom brødrene. Lord Garmadon ble beseiret og forvist til Underverdenen. Den yngste broren, Wu, gjemte de gylne våpnene i de fjerneste avkroker på NINJAGO øya, og nok en gang hersket freden. Århundrer senere leter Wu opp fire modige gutter, Cole, Jay, Kai og Zane, som han trener opp i Spinjitzuens mysterier for at de skal bli de gylne våpnenes voktere.
Two teenagers from different worlds use their newly discovered Ninja powers to defend dragons from villains who want to use their life-force for evil.
In his quest for a bride to break his immortal curse, a 939-year-old guardian of souls meets a grim reaper and a sprightly student with a tragic past.
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