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Sal Ponti as Demetrios |
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Joyce Taylor as Princess Antillia |
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John Dall as Zaren |
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William Smith as Captain of the Guard |
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Edward Platt as Azor the High Priest |
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Frank De Kova as Sonoy the Astrologer |
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Berry Kroeger as Surgeon |
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Edgar Stehli as King Kronas |
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Wolfe Barzell as Petros, Demetrios' Father |
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Jay Novello as Xandros the Greek Slave |
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Paul Frees as Narrator / Multiple Voices (voice) |
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Nestor Paiva as Megalos (uncredited) |
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John Hart as Nobleman (uncredited) |
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Phyllis Douglas as Girl (uncredited) |
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I. Stanford Jolley as Governor of Rivers (uncredited) |
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Gene Roth as Governor of Animals (uncredited) |
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Charles Horvath as Nobleman (uncredited) |
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Charles Cirillo as Slave (uncredited) |
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George Bruggeman as Guard (uncredited) |
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Robert 'Big Buck' Maffei as Andex the Giant (uncredited) |
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Byron Morrow as Governor of the Mountains (uncredited) |
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Will J. White as Officer (uncredited) |
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Ralph Smiley as Pavlo (uncredited) |
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Harry Fleer as Governor of Science (uncredited) |
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David Dyer as Priest (uncredited) |
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Alan Callow as Norseman Slave (uncredited) |
| Production | George Pal | Producer |
| Directing | George Pal | Director |
| Writing | Daniel Mainwaring | Writer |
| Crew | Charles Horvath | Stunts |
| Crew | Roy Jenson | Stunts |
| Crew | Paul Baxley | Stunts |
| Sound | Russell Garcia | Original Music Composer |
| Art | William Ferrari | Art Direction |
| Visual Effects | Jim Danforth | Visual Effects |
| Writing | Gerald Hargreaves | Theatre Play |
| Visual Effects | Wah Chang | Visual Effects |
| Crew | Lee LeBlanc | Special Effects |
| Crew | Robert R. Hoag | Special Effects |
| Editing | Ben Lewis | Editor |
| Visual Effects | Gene Warren | Visual Effects |
| Crew | A. Arnold Gillespie | Special Effects |
| Camera | Harold E. Wellman | Director of Photography |
| Art | Richard Pefferle | Set Decoration |
| Art | George W. Davis | Art Direction |
| Costume & Make-Up | William Tuttle | Makeup Artist |
| Costume & Make-Up | Mary Keats | Hairstylist |
| Art | Henry Grace | Set Decoration |
| Costume & Make-Up | John Truwe | Makeup Artist |
| Sound | Franklin Milton | Recording Supervision |
