 | James Garner als William Beddoes |
 | Melina Mercouri als Aurora / Celeste da Costa |
 | Sandra Dee als Amy Franklin |
 | Anthony Franciosa als Steve / Antonio |
 | Robert Coote als Hatton / Jones |
 | Roland Culver als Doctor Mathieson |
 | Grégoire Aslan als Florian |
 | Cecil Parker als Sir Huntley Frazier |
 | Dulcie Gray als Mrs. Mathieson |
 | Martin Benson als Politanu |
 | Peter Illing als Zarik |
 | Niall MacGinnis als Ship's Captain |
 | Virgílio Teixeira als Inspector Rodrigues |
| Ronald Neame | Director |
| David E. Walker | Novel |
| T. E. B. Clarke | Screenplay |
| Cliff Owen | Director |
| Richard L. Breen | Screenplay |
| Alma Macrorie | Editor |
| Gábor Pogány | Director of Photography |
| Robert Arthur | Producer |
| James Garner | Executive Producer |
| Ernest B. Wehmeyer | Associate Producer |
| Bert Kaempfert | Original Music Composer |
| John DeCuir | Art Direction |
| Tom Hale | Art Direction |
| Giuseppe Chevalier | Set Decoration |
| Gilbert Kurland | Unit Production Manager |
| Edward Muhl | Executive In Charge Of Production |
| William Russell | Sound |
| Waldon O. Watson | Sound |
| John Daheim | Stunts |
| Roberto Fizz | Assistant Director |
| Mauro Sacripanti | Assistant Director |
| Douglas Green | Assistant Director |
| Joseph Gershenson | Music Supervisor |
| Dimis Kritsas | Wardrobe Coordinator |
| Jean Louis | Wardrobe Coordinator |
