A new day dawns in a new Ninjago City as the Ninja, teachers in Sensei Wu's Academy, long for the days of fighting evil, but things in their homeland have become so technologically advanced that they don't feel needed, but they may be very wrong.

After being pursued to Sensei Garmadon's monastery by the Nindroids, the ninjas sneak back into Ninjago City under the guise of a circus train.

The power is out all over Ninjago. However a mysterious Stranger is sending alternatively powered Nindroids to attack the Ninja and capture Lloyd.

Underneath Ninjago City, the ninjas discover secrets about the Serpentine when they fight alongside them against the Nindroids.

Pythor the Anacondrai and his Nindroids have captured Lloyd and are draining his golden powers to bring the Overlord back to Ninjago. And the Ninja must use their Techno Blades in a daring rescue - inside the Overlord's corrupted hard drive.

Lloyd is free but Pythor and the Overlord are nowhere to be found. However, the Ninja have a cryptic clue to their next plan - something called Codename: Arcturus. But what is it? Finding out won't be easy but it will ultimately take the Ninja to a place they never ever thought they would go.

The Ninja will have to quickly adapt to space as they race the Nindroids to retrieve the Golden Weapons of Spinjitzu. But one thing is getting to space. Another is to get safely back home again.

Back in Ninjago it is time for the final battle with the reborn, god-like Overlord called "The Golden Master". The stakes have never been greater and one ninja must make the ultimate sacrifice to try to stop his reign of destruction.