Directed by
| James Kelley | ... | (as James Kelly) (directed by) |
| Andrea Bianchi | ... | (co-director) (as Andrew White) |
Writing Credits
| Trevor Preston | ... | (original screenplay by) |
| Andrea Bianchi | ||
| Erich Kröhnke | ... | (story) |
| Bautista Lacasa Nebot | ... | (as Bautista Lacasa) |
Cast (in credits order) complete, awaiting verification
| Mark Lester | ... | Marcus | |
| Britt Ekland | ... | Elise | |
| Hardy Krüger | ... | Paul | |
| Lilli Palmer | ... | Dr. Viorne | |
| Harry Andrews | ... | Headmaster | |
| Conchita Montes | ... | Sophie | |
 |
Colette Jack | ... | Sarah (as Collette Jack) |
| Rest of cast listed alphabetically: | |||
| Ricardo Palacios | ... | Party Guest | |
| Emilio Rodríguez | |||
|
|
Ricardo Valle | ||
Produced by
| Andrés Vicente Gómez | ... | executive producer |
| Graham Harris | ... | producer (produced by) |
| Harry Alan Towers | ... | producer (uncredited) |
| Oliver A. Unger | ... | executive producer |
Music by
| Stelvio Cipriani | ... | (music composed by) |
Cinematography by
| Luis Cuadrado | ... | director of photography |
| Harry Waxman | ... | director of photography |
Editing by
| Nicholas Wentworth | ... | film editor |
Production Management
| Primitivo Álvaro | ... | production manager |
Second Unit Director or Assistant Director
| José Luis Ruiz Marcos | ... | assistant director |
Sound Department
| Roger Goodall | ... | sound recordist |
| Brian Holland | ... | sound editor |
| John Ireland | ... | sound editor |
| Peter Lodge | ... | sound recordist |
Camera and Electrical Department
| Wally Byatt | ... | camera operator (as Walter Byatt) |
| Ronnie Maasz | ... | camera operator |
Editorial Department
| Alan Jones | ... | assistant editor |
Location Management
| John Southwood | ... | location manager |
Music Department
| Stelvio Cipriani | ... | conductor |
Script and Continuity Department
| Isabel Mulá | ... | script supervisor |
