 | Maximilian Schell als Stanislaw Pilgrin |
 | Samantha Eggar als Fabienne Wolf |
 | Ingrid Thulin als Dr. Michele Wolf |
 | Herbert Lom als Dr. Charles Bovard |
 | Talitha Pol als Claudine |
 | Vladek Sheybal als Manager |
 | Viviane Ventura als Receptionist |
 | Jacques Cey |
 | Jacques Brunius |
 | Andre Charisse |
 | Danièle Noël |
 | Arnold Diamond |
| J. Lee Thompson | Director |
| Julius J. Epstein | Screenplay |
| Hubert Monteilhet | Novel |
| Christopher Challis | Director of Photography |
| J. Lee Thompson | Producer |
| Lewis J. Rachmil | Executive Producer |
| Cecil F. Ford | Associate Producer |
| John Dankworth | Music |
| Russell Lloyd | Editor |
| Charles Blair | Production Manager |
| Kip Gowans | Assistant Director |
