 | Kirk Douglas als Will Denton |
 | Yul Brynner als Jonathan Kongre |
 | Samantha Eggar als Arabella |
 | Jean-Claude Drouot als Virgilio |
 | Fernando Rey als Captain Moriz |
 | Renato Salvatori als Montefiore |
 | Massimo Ranieri als Felipe |
 | Aldo Sambrell als Tarcante (as Aldo Sanbrell) |
 | Tito García als Emilio (as Tito Garcia) |
 | Víctor Israel als Das Mortes (as Victor Israel) |
| Antonio Rebollo als Santos (as Tony Skios) |
 | Luis Barboo als Calsa Larga (as Luis Bar Boo) |
| Tony Cyrus als Valgolyo |
| Raúl Castro als Malapinha |
| Oscar Davis als Amador |
| Alejandro de Enciso als Morabbito |
| Martin Uviente als Balduino (as Martin Uvience) |
| John Clark als Matt |
| Maria Borge als Emily Jane |
 | Juan Cazalilla als Captain Lafayette |
| Kevin Billington | Director |
| Jules Verne | Novel |
| Kirk Douglas | Producer |
| Piero Piccioni | Original Music Composer |
| Bert Bates | Editor |
| Tom Rowe | Screenplay |
| Rachel Billington | Additional Dialogue |
| Ilya Salkind | Associate Producer |
| Henri Decaë | Director of Photography |
| Alfredo Matas | Executive Producer |
| John Merrick | Casting |
| Deirdre Clancy | Costume Design |
| Manolo Mampaso | Costume Design |
| Enrique Alarcón | Art Direction |
| Ramón de Diego | Makeup Artist |
| José Antonio Sánchez | Makeup Artist |
| Josefa Rubio | Hairstylist |
| Francisco Romero | Production Manager |
| Antonio Molina | Special Effects |
| Richard M. Parker | Special Effects |
| Rachel Billington | Writer |
| José Manuel M. Herrero | Production Supervisor |
| Eduardo Noé | Camera Operator |
| Teddy Mason | Sound Editor |
| A.J. Willis | Sound |
| Enrique Molinero | Sound |
| Julio Sempere | Assistant Director |
| Jane Buck | Continuity |
| Juan Estelrich March | Second Unit Director |
| Cecilio Paniagua | Second Unit Director of Photography |
