Alex and Zoe stumble upon a magic portal in the library and are transported to the world of 'Animalia', where animals can talk. Animalia is ruled by 'the Core', a massive organic orb. It has been malfunctioning of late, bringing instability to the kingdom. G'Bubu the gorilla is swept back in time to an era when his ancestors fought for control of the trees against their enemies, the giant tree frogs.