The great battle at the oaks has barely ended when suddenly two strange strays appear in the forest – and Cloudsky's son Thunder immediately falls in love with the she-cat. While the cats are still licking their wounds, a devastating illness breaks out in both camps. But a message from the warrior ancestors brings hope: the clans must grow and spread like the shining star. Will the foreign cats help the camp cats in this, or will they sabotage the newly established peace?.