More and more cats join, and eventually, the newly rebuilt SkyClan, along with Firestar and Sandstorm, fight a gigantic swarm of rats. It is revealed that the rats are what killed off SkyClan after it left the forest many years ago. They defeat the rats, and their mission is completed. Firestar and Sandstorm leave SkyClan, knowing that its new leader, Leafstar, will lead it well.