Long ago in a magical world, Jason is raised in the forest by the centaur Chiron. Wise Chiron plays music and teaches him about nature and the animals, but Jason is impatient to become a hero. When Jason turns 19, he learns that his uncle Pelias has taken the throne that should be his.
Jason goes to reclaim his throne, but King Pelias says he will give it up only if Jason brings him the Golden Fleece. Jason builds the ship Argo, and with his crew, the Argonauts, he sets sail on his quest.
On their voyage, Jason and the Argonauts face deadly dangers. They sail between sharp, treacherous rocks that snap shut to crush passing ships, and they resist the enchanting song of the evil Siren.
They arrive at Colchis, where King Aeetes has the Golden Fleece. Jason and the king’s daughter Medea fall in love, and she helps him get the Golden Fleece. But just as they are about to leave, they discover the golden Lamb, held captive by King Aeetes. Jason must learn that becoming a true hero means respecting nature. Will he make the right choice?