Joust In Time

The mascot of an interplanetary sports team comes to Earth to teach people how to play fair in sports. His name is Billy, and he came from the planet Olympus (whose god-like populace was largely given, naturally, to good sportsmanship and fair play). Together with his pals Lilly and Willy, Billy travelled the globe in their timeship in sports-focused stories, which emphasized values and fair play.