Caveboy Charlie Flint has come up with a wonderful new invention - a loo for dinosaurs. Their poo is washed away underground, and so they get rid of a rather smelly problem. But the giant millipedes who live down there aren't very happy. They keep treading in dinopoo - and when you have as many legs as they do, that's a lot of treading! Charlie soon finds himself pitted against the fearsome king of the millipedes and in a very sticky situation!