Long before time had a name, the NINJAGO world was created by the First Spinjitzu Master by using the Four Golden Weapons of Spinjitzu; weapons so powerful, no one could handle all of their power at once. When he passed away, his two sons swore to protect them, but the oldest, Lord Garmadon, was consumed by darkness and wanted to possess them all. A battle between brothers broke out. Lord Garmadon was defeated and banished to the Underworld. Peace returned to the island as the younger brother, Wu, hid the Golden Weapons in the far corners of NINJAGO Island.
Centuries later, Wu seeks out four brave boys – Cole, Jay, Kai and Zane – whom he trains in the art of Spinjitzu to become protectors of the Golden Weapons. Kai is the last one to be recruited by Wu. When Kai meets Wu for the first time, Samukai and his evil Skeleton Army show up to kidnap Kai’s sister, Nya, and steal the map showing the location of the Golden Weapons. Behind the kidnapping is Lord Garmadon, who is controlling the Underworld. The fire ignites within Kai. He is determined to save Nya, so he follows Wu to join the rest of the ninja. Cole, Jay, Kai and Zane use their ninja training in defeating the Skeleton Army, naturally learning the art of Spinjitzu.
Although the ninja successfully survive a harrowing quest to retrieve the Golden Weapons, they fall into Lord Garmadon’s master plan, allowing him to escape the Underworld through a portal to the Dark Realm, with hope that he one day would return with the ability to possess all four weapons. Peace returns to NINJAGO Island, while the four ninja swear to protect the Golden Weapons… Awaiting Lord Garmadon’s arrival.