|Jack Gwillim||King Aeetes|
|Nando Poggi||Castor (uncredited)|
|John Crawford||Polydeuces (uncredited)|
|Douglas Robinson||Eupaemus (uncredited)|
After saving the life of his royal father's usurper, Pelias, whom he fails to recognize, Jason is encouraged by the conniving murderer to begin a quest in search of the Golden Fleece. In doing so, Pelias hopes for Jason's death to thwart the prophecy that he will reclaim the throne. Along the journey, Jason is protected by the goddess Hera, and his crew includes Hercules and Acastus, a saboteur planted by Pelias.