When a sorcerer steals a powerful enchanted crystal from the ancient wizard Nereus, apprentice Mickey Mouse travels to the capital of Grandhaven to reclaim the crystal before Nereus realizes it's gone. His search leads him to the Great Wizarding Tournament, which he enters with two young magicians 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...