When a sorcerer steals a powerful magic crystal from the ancient wizard Nereus, apprentice Mickey Mouse travels to the capital of Grandhaven to reclaim it before Nereus realizes it's gone. His search leads him to the Grand Sorcerers Tournament, which he enters with two young wizards he meets along the way-Goofy and Donald Duck. Little does he know, a far more sinister plot is unfolding in the shadows of the competition...