In the Metro Library, human kids ALEX and ZOE enter a strange portal that carries them to the talking-animal world of ANIMALIA, where they are mistaken for invading monsters by the general population. They meet Animalia's ruler, LIVINGSTONE, who befriends the kids and asks for their help in repairing the CORE, the magic orb that is at the center of Animalia's well-being. Alex and Zoe are taken under the wing of gentle but strong G'BUBU Gorilla and his best pal, the boastful IGGY. We also meet the librarian, REENIE RHINO, the Elephants, the Zebras, the Hogs, the Media Mice, and the series' two significant trouble-makers: ALLEGRA ALLIGATOR and TYRANNICUS TIGER, who take an immediate dislike to the human arrivals.