The brawling bulldozer Slamdroid is back and the unstoppable demolition droid has the Region of Ruins in its sights, determined to reduce tranquil Harmonia to rubble. Matt, Roxie and Gomez rush to the defence of the community but if they can't withstand the bludgeoning force of Slamdroid, Matt must put all their hopes in the crushing claws of one of his most fearsome enemies - Scorpiotron!