Johnny Mysto: Boy Wizard (1997)

Novice magician Johnny Mysto dreams of going back in time to visit the magicians of earlier eras. He recruits TV magician Blackmoor and begins his own time-travel quest. After accidentally transporting his younger sister to medieval times during a magic trick, Johnny has even more incentive. Guided by his mystical ring, Johnny travels all the way to Camelot, meeting ancient legends Merlin and King Arthur along the way.