When a princess is shrunken by an evil wizard, Sinbad must undertake a quest to an island of monsters to cure her and prevent a war.

Sinbad and his crew intercept a homunculus carrying a golden tablet. Koura, the creator of the homunculus and practitioner of evil magic, wants the tablet back and pursues Sinbad. Meanwhile, Sinbad meets the Vizier who has another part of the interlocking golden map, and they mount a quest across the seas to solve the riddle of the map.

Princess Farah refuses to marry Sinbad until Prince Kassim, her brother, is able to give his consent. However, the Prince's wicked stepmother, Queen Zenobia, has changed Kassim into a baboon in order to have her own son crowned as caliph. Sinbad, his crew, the Princess and the transformed Prince travel to a distant land, fighting every obstacle Zenobia places in their path, to seek the advice of a legendary wise man who can possibly tell how to end the spell.