Alex finds the Guardians of the Core Guidebook, which provides words and phrases that can help the Core. But when Alex isn't careful with the words he uses the Core becomes a musical jukebox causing Animalias to sing and dance uncontrollably. In the Catacombs, Alex and Zoe discover that they are the "Guardians of the Core" with special powers to help heal the Core. They restore peace to Animalia by singing the Core a lullaby.