CGI animated series about a pair of children who stumble upon a magic portal in the library and are transported to the world of Animalia, where animals can talk. Livingstone and Reenie are struck by the glums, a rare Animalian version of the blues. There is only one cure for the syndrome: a good, long laugh. But those affected with the glums don't find anything the least bit funny, so Alex, Zoe, G'Bubu and Iggy must criss-cross the kingdom in search of the funniest joke in Animalia.