 | Florinda Bolkan als Carol Hammond |
 | Stanley Baker als Inspector Corvin |
 | Jean Sorel als Frank Hammond |
 | Silvia Monti als Deborah |
 | Alberto de Mendoza als Sergeant Brandon |
 | Penny Brown als Jenny |
 | Mike Kennedy als Hubert |
 | Ely Galleani als Joan Hammond |
 | George Rigaud als Dr. Kerr |
 | Ezio Marano als Lowell - Scientific Squad |
 | Franco Balducci als McKenna |
 | Luigi Antonio Guerra als Policeman |
 | Erzsi Paál als Mrs. Gordon |
 | Gaetano Imbró als Policeman |
 | Leo Genn als Edmond Brighton |
 | Anita Strindberg als Julia Durer (uncredited) |
 | Tony Adams als Policeman (uncredited) |
| Jean Degrave als St. Paul's Clinic Director (uncredited) |
 | Basil Dignam als Commissioner McCloud (uncredited) |
| Ursel Eberz als Policewoman Beth (uncredited) |
| Piero Nistri als Mrs. Gordon's Chauffeur (uncredited) |
 | Fred Wood als Train passenger |
| John Clifford als Train Passenger (uncredited) |
| Lew Hooper als Policeman (uncredited) |
| George Spence als Train Passenger (uncredited) |
| Rita Tobin-Weske als Train Passenger (uncredited) |
| Fred Wood als Train Passenger (uncredited) |
| Jack Armstrong |
| Lucio Fulci | Director |
| Lucio Fulci | Screenplay |
| Lucio Fulci | Story |
| José Luis Martínez Mollá | Screenplay |
| André Tranché | Screenplay |
| Edmondo Amati | Producer |
| Renato Jaboni | Executive Producer |
| Roberto Gianviti | Screenplay |
| Roberto Gianviti | Story |
| Luigi Kuveiller | Director of Photography |
| Ennio Morricone | Original Music Composer |
| Carlo Rambaldi | Special Effects |
| Nedo Azzini | Production Design |
| Román Calatayud | Art Direction |
| Maurizio Chiari | Art Direction |
| Nedo Azzini | Set Decoration |
| Roberto Granieri | Set Decoration |
| Maurizio Chiari | Costume Design |
| Giorgio Serrallonga | Editor |
| Vincenzo Tomassi | Editor |
| Ottavio Jemma | Screenplay |
| Robert Dorfmann | Co-Producer |
| José Frade | Co-Producer |
| Franco Di Girolamo | Key Makeup Artist |
| Gloria Fava | Assistant Makeup Artist |
| Rosa Luciani | Hairstylist |
| Luis Méndez | Production Director |
| Giorgio Gentili | Assistant Director |
| Maurizio Chiari | Set Designer |
| Claudio De Santis | Assistant Set Designer |
| Massimo Iabone | Sound |
| Mario Morigi | Sound Mixer |
| Eugenio Ascani | Special Effects |
| Carlo De Marchis | Special Effects Assistant |
| Antonio Annunziata | First Assistant Camera |
| Enrico Bellacci | Electrician |
| Giovanni Bonivento | Second Assistant Camera |
| Santiago Gómez | Third Assistant Camera |
| Saturnino Pita | Camera Operator |
| Spartaco Pizzi | Key Grip |
| Ubaldo Terzano | Camera Operator |
| Giorgio Desideri | Costume Assistant |
| Rita Antonelli | Assistant Editor |
| Lea Piras | Assistant Editor |
| Vincenzo Tomassi | Supervising Editor |
| Bruno Nicolai | Conductor |
| Roberto Giandalia | Continuity |
| Enrique Bellot | Production Secretary |
| Roberto Carpentieri | Production Secretary |
| The Duchess of Bedford | Thanks |
| Andrew Ian Henry Russell | Thanks |
