The Plot (mild spoiler warning)
Peter Dickinson (voiced by John Ritter) is a poor, dreaming scientist/inventor who is transported into the failing world of magic. He meets three wizards, two dragons, and the beautiful Princess Melisande.
The green wizard Carolinus (voiced by Harry Morgan, his brother Lo Tae Shao (voiced by Don Messick), and the blue wizard Solarius explain that the world of magic is dying. To save it, they must join together to create the 'Last Realm of Magic' -- a protected place where magic will live on after humans stop believing. The red wizard Ommadon (voiced by James Earl Jones) has refused to aid his brothers, and vows to dominate humanity, in an attempt to stop magic's death by force. The only way to stop him is to take his Red Crown, which holds his power. Peter, being descended from an ancient hero, is asked to begin a quest.
But before the journey begins, a magical mishap leaves Peter in the body of the house-dragon Gorbash. Knowing nothing about being a dragon or about magic, Peter travels with two other companions, Sir Orin Neville Smythe, (voiced by Bob McFadden) and the dragon Smergol (voiced by James Gregory) who try to teach Peter the finer points of being a dragon. Many adventures ensue.