A civil war rages in our galaxy. To further their war aims, the TeraGon, a manufactured warrior race, attempts to capture Earth. And to thwart their plans, the Order, the TeraGons' former masters and now their foes, appoint 13-year-old Mark Numan as his world's sole Guardian.
But Mark quickly learns the TeraGons aren't his only enemy. And the Earth proves not to be just another world to be conquered but is crucial to the fate of the galaxy, and even the entire multiverse!