Long before time had a name, Ninjago was created by the First Spinjitzu Master by using the Four Elemental Weapons of Spinjitzu; weapons so powerful, no one can 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 and Lord Garmadon was struck down and banished to the Underworld. Peace returned to Ninjago as the younger brother, Sensei Wu, hid the elemental weapons in the far corners of Ninjago.
While Lloyd and Nya resist Emperor Garmadon's oppressive hold on Ninjago City, Young Wu and the rest of the Ninja are stranded in a barbaric realm where fierce dragons are being hunted down by Iron Baron and his gang of Dragon Hunters. Lloyd must endure in NINJAGO City, the others need to find the fabled Dragon Armor if they ever hope to get back home to stop Emperor Garmadon once and for all.
Emperor Garmadon has taken control of Ninjago City where Lloyd retreats to the shadows. Meanwhile, the other Ninja and Young Wu are shipwrecked in the Realm of Oni & Dragon and find they are not alone.
Kai, Jay and Zane continue their fight against the Dragon Hunters in Dead's End, as their elemental powers have now been exposed.
Lloyd must find his voice as he leads a small resistance to capture the airwaves in Ninjago City. Meanwhile in the First Realm, Iron Baron takes the Ninja on a dragon hunt.
The headquarters to the resistance is breached and Lloyd scrambles to avoid capture. Meanwhile, the Ninja are caught by Heavy Metal, but find an unlikely ally.
As Lloyd unmasks Mystaké for who she really is, Emperor Garmadon embraces Harumi as his daughter of darkness.
Faith trains the Ninja and Wu to use vengestone harpoons, also teaching Wu to fly a dragon. However, they are found by the Dragon Hunters and the Iron Baron, thus a chase begins.