Junks, an evil alien scourge, are flooding Quad-Gal with terror and Combat K are sent on a mission to find an elusive alien retrovirus which can be used against the enemy. SLAM-dropped to Cloneworld – a planet ravaged by violent civil war – not only are Combat K hunted by elite junk assassins, but they get caught in a global conflict between augmented mechanised war machines and genetically modified humans who have the ability to clone themselves. Combat K must fight their way to victory to save the Four Galaxies. But how can they possibly succeed, when their main foe are their own elite and deadly clones?