Say 'Hoobledoop!' to Jim Henson's Hoobs, the happiest and hoobygrooviest explorers in the universe. Iver, Tula, and Groove have traveled to Earth in their colorful Hoobmobile from the sunny, funny world of Hoobland. Every day is a new adventure as they seek answers to their questions about how things work, such as: Why do birds sing? Why does water fall from the sky? And which flower is the most hoobacious of all?