The eponymous Wattoo Wattoo is a black and white ovoid bird. He comes from a cube-shaped planet called Auguste. In the first episode he becomes aware of the very stupid and extremely wasterful race called Zwas. The Zwas are goose-like creatures that live on the Earth in cities very much like our own. They have exaggerated human characteristics, they are irrascible, badly behaved and generally thoughtless. The Zwas are not without kindness however and many of them keep pets called Credo who are spheroid cats, dogs and other similar creatures. Often the actions of the Zwas puts the Credos in danger.
Throughout the series Wattoo Wattoo helps the Zwas overcome their problems through the use of his seemingly magical powers. He is able to transform himself into any shape. Should he need the help of others of his race he has only to whistle. Other identicle birds respond to the call and come down from space like comets. As they fly down they vibrate and duplicate themselves until they are a flock ready to take on whatever challenge is required of them.