The Moon Dragon (Secrets of Droon) by Tony Abbott
Eric and his friends have finally made the rainbow stairs reappear-linking Droon back into their world. But that was the easy part. Noe Gethwing, the moon dragon has taken over their hometown! He's on the hunt for a magical object that could make him more powerful than ever. To make matters worse-the evil dragon has kidnapped most of the townspeople including the kid's dream. Can Eric and his friends stop Gethwing before he destroys the Upper World for good?