When the winter doldrums arrive at the zoo, a very small hippo and a young kangaroo decide to stage a "ZooZical," a show to display their singing, dancing, acrobatic, and other talents to the people of Springfield.

A librarian named Mavis McGrew introduces the animals in the zoo to the joy of reading when she drives her bookmobile to the zoo by mistake. Al conducir el bibliobús al zoológico por error, la bibliotecaria introduce el placer de la lectura a los animales del zoológico.