Directed by
| Juan Piquer Simón | ||
Writing Credits (in alphabetical order)
| Joaquín Grau | ... | (as Jack Gray in US version) |
| Juan Piquer Simón | ||
Cast (in credits order) complete, awaiting verification
| Ian Serra | ... | Rick (as Ian Sera) | |
 |
Nina Ferrer | ... | Sharon |
| Susana Bequer | ... | Lara Stapleton (as Susan Blake) | |
|
|
Sara Palmer | ... | Kathy |
| Óscar Martín | ... | Tommy Stevens | |
|
|
Maria Albert | ... | Tracy |
|
|
Emilio Linder | ... | Brian (as Emil Linder) |
| Concha Cuetos | ... | Molly Stevens (as Connie Cheston) | |
| Manuel Pereiro | ... | Bill Stevens | |
| Frank Braña | ... | Burt | |
|
|
Guillermo Antón | ... | Matt Collins (as William Anton) |
|
|
Frank Sussman | ... | (as Frank Suzman) |
|
|
Gary Richardson | ||
|
|
Hugo Astar | ||
|
|
Luis M. Martín | ... | (as Louis Martin) |
|
|
Marcos Treviño | ... | (as Mark Treving) |
| Rest of cast listed alphabetically: | |||
| George Stover | ... | Man who gets killed in opening credits: Film Ventures International version (archive footage) (uncredited) | |
Produced by
| Faruk Alatan | ... | executive producer |
| Edward L. Montoro | ... | executive producer (US version) |
| Dick Randall | ... | executive producer |
Music by
| Michael Demer | ||
| Librado Pastor | ... | (as Libra Pastor) |
Cinematography by
| Juan Mariné | ... | (US version) (as John Marine) |
| Ricardo Navarrete | ||
Editing by
| Antonio Gimeno | ... | (US version) (as Tony James) |
Set Decoration by
| Emilio Ruiz del Río | ... | (as Emilio G. Ruiz) |
Makeup Department
| Pedro Camacho | ... | makeup artist |
Production Management
| Emanuel Pine | ... | production manager |
| Manuel Pinilla | ... | production manager |
Art Department
| Vicente Cervantes | ... | set dresser |
Sound Department
| Jorge Rodríguez Inclán | ... | sound effects (US version) (as Jorge Rodríguez) (as George Rodriguez) |
Special Effects by
| Basilio Cortijo | ... | special effects (as Basil Court in US version) |
Visual Effects by
| Juan Piquer Simón | ... | visual effects |
Camera and Electrical Department
| Ricardo Navarrete | ... | 2 degree operator (as Richard Navarro) |
| Peter Villard | ... | 3 degree operator |
Editorial Department
| Beatriz Cervantes | ... | assistant editor |
Additional Crew
| Juan Fava | ... | consultant: xenobiology |
| Géneviève Hersent | ... | voice dubbing: Concha Cuetos (english version) |
| Héctor Cantolla | ... | voice dubbing: Guillermo Antón (uncredited) |
| Gloria Cámara | ... | voice dubbing: María Albert (uncredited) |
| Rafael de Penagos | ... | voice dubbing (uncredited) |
| Benjamín Domingo | ... | voice dubbing: Manuel Pereiro (uncredited) |
| Javier Dotú | ... | voice dubbing: Ian Sera (uncredited) |
| Paloma Escola | ... | voice dubbing: Nina Ferrer (uncredited) |
| Amelia Jara | ... | voice dubbing: Óscar Martín (uncredited) |
| Eduardo Jover | ... | voice dubbing (uncredited) |
| Steven Luotto | ... | voice dubbing (English version) (uncredited) |
| Edward Mannix | ... | voice dubbing (English version) (uncredited) |
| Luis Porcar | ... | voice dubbing: Emilio Linder (uncredited) |
| Claudio Rodríguez | ... | voice dubbing: Frank Braña (uncredited) |
| Pat Starke | ... | voice dubbing (English version) (uncredited) |
| Selica Torcal | ... | voice dubbing: Susana Bequer (uncredited) |
| Frank von Kuegelgen | ... | voice dubbing: Emilio Linder (English version) (uncredited) |
