When Corespore blast off, Alex and Zoe must track them down and restore them to the Core or the Animalian population will return to its feral, uncivilized state. Zoe is torn between Animalia and her need to return home. As Alex and Zoe search for the missing core spores, the Animalians begin to exhibit strange behaviour, losing the power of communication and returning to their non-civilized state.