Syracuse lies between the warring nations of Rome and Carthage; as long as the balance of power between the nations remains intact, both nations are willing to preserve the neutrality of Syracuse. However, Rome has now gotten the upper hand in its struggle for power. The fate of Syracuse lies in the hands of its leader, the famed inventor and scientist Archimedes.
| Actor | Role |
|---|---|
 Rossano BrazziArchimede | Archimede |
 Tina LouiseDiana / Artemide / Lucrezia | Diana / Artemide / Lucrezia |
 Sylva KoscinaClio | Clio |
| EEnrico Maria SalernoGorgia | Gorgia |
 Gino CerviGerone | Gerone |
 Alberto FarneseMarcello | Marcello |
 Luciano MarinMarco | Marco |
 Alfredo VarelliKriton | Kriton |
| WWalter GrantTiresias | Tiresias |
| MMara LombardoSelinonte Dancer | Selinonte Dancer |
| CCorinne CapriGirl in Troupe (uncredited) | Girl in Troupe (uncredited) |
 Enzo CerusicoGiovane allievo (uncredited) | Giovane allievo (uncredited) |
| AAntonio CoreviNobleman (uncredited) | Nobleman (uncredited) |
 Consalvo Dell'ArtiCitizen (uncredited) | Citizen (uncredited) |
 Cesare FantoniPadre di Archimede (uncredited) | Padre di Archimede (uncredited) |
 Veriano GinesiUomo al taverna (uncredited) | Uomo al taverna (uncredited) |
| TTakis KavourasGuard (uncredited) | Guard (uncredited) |
 Enrico OlivieriGiovane apprendista (uncredited) | Giovane apprendista (uncredited) |
| EErminio SpallaTaverniere (uncredited) | Taverniere (uncredited) |