Professor Bubble is compiling the definitive book of the universe and everything in it, entitled The A-Z of Everything. Feeling that he would be in a better position to conduct his studies if he were not earth-bound, the Professor launched his house into the clouds. He observes the world and gathers information through "the bubblescope" - a telescope which protrudes through the bottom of 'Cloud 9' - the cloud on which his house came to rest. The Professor is aided by his three helpers - Beamer, Mouse and Quill - whose antics on Cloud 9 provide links to the live-action educational segments.
