In this melange of characters and events from separate mythological stories, Hercules, demigod and superman, arrives in the ancient Greek kingdom of Iolcus to tutor Iphitus, son of king Pelias; immediately on arrival, he falls in love with the king's delectable, briefly clad daughter Iole. Before he can win her, he must succeed in a series of quests, in the course of which he teams up with Jason, true heir of Iolcus, whom he accompanies on the famous voyage of the Argonauts.
| Actor | Role |
|---|---|
 Steve ReevesErcole (Hercules) | Ercole (Hercules) |
 Sylva KoscinaIole, Daugher of Pelias | Iole, Daugher of Pelias |
 Fabrizio MioniJason | Jason |
 Gianna Maria CanaleAntea, Queen of the Amazons | Antea, Queen of the Amazons |
 Arturo DominiciEurysteus | Eurysteus |
 Mimmo PalmaraIphitus, Son of Pelias | Iphitus, Son of Pelias |
 Lidia AlfonsiThe Sybil | The Sybil |
 Gabriele AntoniniUlysses | Ulysses |
 Aldo FiorelliArgos | Argos |
 Andrea FantasiaLaertes | Laertes |
 Luciana PaluzziIole's Maid | Iole's Maid |
 Ivo GarraniPelias, King of Iolcus | Pelias, King of Iolcus |
 Gina Rovereamazzone | amazzone |
| LLily Granadoamazzone | amazzone |
 Afro PoliChironi | Chironi |
 Gino MatteraOrpheus | Orpheus |
 Gian Paolo RosminoAesculapius | Aesculapius |
 Willi ColombiniNot listed | Not listed |
| FFulvio CarraraNot listed | Not listed |
 Aldo PiniTifi | Tifi |
| GGuido MartufiIphitus as a child | Iphitus as a child |
 Paola QuattriniIole as a child | Iole as a child |
| RRomano BarbieriNot listed | Not listed |
| AAugusto BelardelliNot listed | Not listed |
| SSpartaco NaleNot listed | Not listed |