A shipwreck casts members of a royal court ashore on a mysterious island. Their fateful arrival is no accident, for it was engineered by Prospera (Helen Mirren), a sorceress whom these men banished, and who now plans to take vengeance on them. With the help of Caliban and Ariel, her sometimes-unwilling aides, Prospera brings her powers to bear on her former tormentors. Then love casts a spell on her daughter and the king's son, and Prospera is powerless to intervene.