Iron & Stone through How to Build a Dragon
Nya had ditched the battle wagon across the city. The Resistance later try to find it. On the way, Nya gets into a fight with Ultra Violet. Soon, Lloyd and Dareth get the Battle Wagon and use it to send Ultra Violet into a wall, destroying the Oni Mask of Hatred.
The Sons of Garmadon arrive and the Resistance is fighting them. The dragons and the ninja return to Ninjago and help the Resistance near the battle wagon. Later, while the ninja and the dragons try to destroy the Colossus, Nya comes in with the battle wagon and helps.