Sinbad and the eye of the tiger (1977)

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.