When River, Freak, and Fiona discover a rare zucchini-colored crayon between the cushions of a mysterious sofa at their bus stop, they quickly find themselves in the middle of an evil plot to conquer the world! The plot's mastermind, Edward Disin, is responsible for starting the underground coal seam fire that continually burns just beyond the kids' backyards, a dastardly cover-up for an intergalactic portal that will soon transport an army of invaders to Earth.
