Trailer
Images
 | Laurence Harvey as Sean McKenna |
 | Sarah Miles as Catherine |
 | Robert Walker Jr. as Dominic |
 | John Ireland as Prison Warden |
 | Ross Martin as Le Caq |
 | Lee Patterson as Nicky |
 | Jack MacGowran as O'Brian |
 | Carlos Casaravilla as Ramades |
 | Fernando Rey as Sanchez |
 | Fernando Sancho as Shaoush |
 | Noel Purcell as Finigan |
 | José Nieto as Inspector |
 | Phil Posner as Prison Official |
 | Rafael Albaicín as Gendarme |
 | James Brown as Gendarme |
 | Murray Melvin as Gendarme |
 | Carlos Chemenal as Gendarme |
| Enrique Closas as Gendarme |
| Juan García Delgado as Gendarme |
 | José Manuel Martín as Gendarme |
| Ricardo Rodríguez as Gendarme |
| Juan Olaguibel as Gendarme |
| Manuel Pêra as Gendarme |
| Francisco Montalvo as Guard |
 | José Riesgo as Guard |
| Barta Barri as Death House Guard |
 | José Guardiola as Gate Guard |
| Edward St. John as Special Guard |
| Jose Trinidad as Police Chauffeur |
 | Eduardo García as Truck Driver |
 | Robert Rietti as Sanchez / Chief Warden |
 | Xan das Bolas |
| Directing | |
| Laurence Harvey | Director |
Writing | |
| Ben Barzman | Screenplay |
| Frédéric Grendel | Novel |
Crew | |
| Laurence Harvey | Additional Dialogue |
| Alun Falconer | Additional Dialogue |
Production | |
| Laurence Harvey | Producer |
Sound | |
| Gerard Schurmann | Original Music Composer |
| Carlo Martelli | Original Music Composer |
Camera | |
| Oswald Morris | Director of Photography |
Editing | |
| Ralph Kemplen | Editor |
Art | |
| Ramiro Gómez | Art Direction |
Costume & Make-Up | |
| George Frost | Makeup Supervisor |
| Betty Glasow | Hairdresser |
Production | |
| Jesús García Gárgoles | Production Manager |
| David Middlemas | Production Supervisor |
Directing | |
| Pedro Vidal | Assistant Director |
Sound | |
| Janet Davidson | Sound Editor |
| Brendan Redmond | Sound Mixer |
| Gordon Davie | Assistant Sound Editor |
Crew | |
| Manuel Baquero | Special Effects |
| Arthur Beavis | Special Effects |
Camera | |
| Brian West | Camera Operator |
Costume & Make-Up | |
| Moss Mabry | Costume Consultant |
Sound | |
| Gerard Schurmann | Conductor |
Directing | |
| Margarita Pardo | Continuity |
Production | |
| Alan Kaplan | Producer's Assistant |
Directing | |
| John Quested | Assistant Director |
