Razing Pel

The Oce, an ancient alien species that cling on to a planet and suck the life from it. Now the Oce have moved to Planet Pel, where a young humanoid boy known as Kaj lives. Kaj joins the Galactic Soldiers, an organization of humans dedicated to destroying the Oce, on a shuttle that will bring him and a group of his species to the last standing city where the final ship awaits to take them off the planet. Will Kaj be able to leave his planet? Can anyone find the weakness to the Oce?