The home of the Khan, King of the Lumpies, has been ransacked. A band of thieves, the rat-faced Snitchers of Zoop, has stolen a mysterious treasure that the Lumpies had vowed to protect. Now Eric, Neal, Julie and Keeah must pursue the Snitchers back to their hideaway on the edge of the dark lands, but they are not alone, for Ko, the kids' more fearsome enemy, is after the treasure too. Can Eric and his friends find it before the King of the beasts?