 | Steve Reeves als Ercole (Hercules) |
 | Sylva Koscina als Iole, bride of Ercole |
 | Sylvia Lopez als Queen Onfale, of Lidia |
 | Gabriele Antonini als Ulisse, son of Laertes |
 | Primo Carnera als Anteo, the giant |
 | Patrizia Della Rovere als Penelope |
 | Sergio Fantoni als Eteocle |
 | Fulvia Franco als Anticlea |
 | Carlo D'Angelo als Creonte, High Priest of Thebes |
 | Marisa Valenti als Blond Slave Girl |
 | Mimmo Palmara als Polinice |
| Elda Tattoli als Altmea - Mother of Ulisses' Girlfriend |
 | Daniele Vargas als Anfiarao |
| Andrea Fantasia als King Laerte |
| Gino Mattera als Orpheo |
 | Aldo Fiorelli als Argos - the Shipbuilder |
| Gianni Loti als Sandone - Captain of the Lidian Guard |
 | Cesare Fantoni als Oedipus - King of Thebes |
 | Ugo Sasso als Polinice's Officer |
 | Angelo Zanolli als Admeo |
 | Sergio Ciani als Megreo - Officer Eating Apple |
 | Aldo Pini als Tifi - Pilot of the Argos |
 | Nando Cicero als Lastene |
 | Willi Colombini |
| Fulvio Carrara |
| Walter Grant als Aesculapio |
| Colleen Bennet als Ballerina at Omphale's Palace |
 | Giuliano Gemma als Melanippo (uncredited) |
| Mario Ghignone als Councilor of Eteocles (uncredited) |
| Nino Marchetti als Fossore (uncredited) |
 | Fabrizio Mioni als Jason (uncredited) |
| Mario Serandrei | Editor |
| Pietro Francisci | Screenplay |
| Enzo Masetti | Original Music Composer |
| Ennio De Concini | Screenplay |
| Pietro Francisci | Director |
| Ubaldo Terzano | Camera Operator |
| Bruno Vailati | Producer |
| Massimo Tavazzi | Set Decoration |
| Mario Bava | Director of Photography |
| Maria Baroni | Costume Design |
| Pietro Francisci | Story |
| Aeschylus | Theatre Play |
| Sophocles | Theatre Play |
| Otello Fava | Makeup Artist |
| Mario Bava | Special Effects |
| Pietro Nuccorini | First Assistant Director |
| Flavio Mogherini | Production Design |
| Giorgio Giovannini | Assistant Production Design |
| Gianni D'Aloisio | Assistant Production Design |
| Barbara Fusch | Script Supervisor |
| Enzo Musumeci Greco | Master at Arms |
| Massimo De Rita | Production Assistant |
| Spartaco Conversi | Production Secretary |
| Dante Brini | Production Secretary |
| Sergio Angeloni | Assistant Makeup Artist |
| Maria Miccinilli | Hairstylist |
| Violetta Pacelli | Assistant Hairstylist |
| Mario Mancini | Assistant Camera |
| Danilo Desideri | Assistant Camera |
| Giulio Tagliacozzo | Sound |
| Giuseppe Muratori | Sound Recordist |
| Bruno Zanoli | Boom Operator |
| Aldo Galfano | Still Photographer |
| Mimma Olivieri | Seamstress |
| Assunta Lazzazera | Seamstress |
| Carlo Savina | Conductor |
| Misa Gabrini | Assistant Editor |
| Ferruccio De Martino | Production Manager |
| Paolo Ketoff | Sound Mixer |
| Renato Cadueri | Sound Mixer |
| Mario Bava | Assistant Director |
