 | Alan Ladd als Dr. James 'Jim' Calder |
 | Sophia Loren als Phaedra |
 | Clifton Webb als Victor Parmalee |
 | Alex Minotis als Milidias Nadapoulos |
 | Jorge Mistral als Rhif |
 | Laurence Naismith als Dr. Hawkins |
 | Piero Giagnoni als Niko |
 | Gertrude Flynn als Miss Dill |
| Jean Negulesco | Director |
| Ivan Moffat | Screenplay |
| Dwight Taylor | Screenplay |
| David Divine | Novel |
| Henry Vilardo | Makeup Artist |
| Giannis Flery | Choreographer |
| Hugo Friedhofer | Original Music Composer |
| Milton Krasner | Director of Photography |
| Lyle R. Wheeler | Art Direction |
| Jack Martin Smith | Art Direction |
| Bruno Avesani | Set Decoration |
| Ugo Pericoli | Set Decoration |
| William Mace | Editor |
| Carlo Lastricati | Assistant Director |
| Eli Dunn | Assistant Director |
| Edward B. Powell | Orchestrator |
| Lionel Newman | Conductor |
| Catherine Reed | Hairstylist |
| W. D. Flick | Sound |
| Harry M. Leonard | Sound |
| Samuel G. Engel | Producer |
| Paul Baxley | Stunt Coordinator |
