| Ian Sera | ... | Rick | |
| Nina Ferrer | ... | Sharon | |
| Susanna 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 | |||
| Gary Richardson | |||
| Hugo Astar | |||
| Luis M. Martín | (as Louis Martin) | ||
| Marcos Treviño | (as Mark Treving) | ||
| rest of cast listed alphabetically: | |||
| Steven Luotto | ... | Rick (voice: English version) (uncredited) | |
| Edward Mannix | ... | Bill Stevens (voice: English version) (uncredited) | |
| Pat Starke | ... | Tracy (voice: English version) (uncredited) | |
| George Stover | ... | Man who gets killed in opening credits (uncredited) | |
| Frank von Kuegelgen | ... | Brian (voice: English version) (uncredited) | |
Directed by | |||
| Juan Piquer Simón | |||
Writing credits(in alphabetical order) | ||
| Joaquín Grau | (as Jack Gray in US version) | |
| Juan Piquer Simón | writer | |
Produced by | |||
| Faruk Alatan | .... | executive producer | |
| Edward L. Montoro | .... | executive producer (US version) | |
| Dick Randall | .... | executive producer | |
Original Music by | |||
| Michael Demer | |||
| Librado Pastor | |||
Cinematography by | |||
| Juan Mariné | (as John Marine in US version) | ||
| Ricardo Navarrete | |||
Film 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 | |
Sound Department | |||
| Jorge Rodríguez Inclán | .... | sound effects (also as George Rodriguez: US version) (as Jorge Rodríguez) | |
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 | |
Other crew | |||
| Juan Fava | .... | consultant: xenobiology | |
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| Dreamcatcher | The Howling | Avatar | Star Wars: Episode VI - Return of the Jedi | I Am Number Four |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb bottom 100 movies | IMDb Sci-Fi section |
| IMDb Spain section |
My favorite scene was the part where the tiny cat starts chomping on Trumpy's nose and wont let go. The actor tries to play it cool by moving along and ignoring it, but the cat is persistent. Everything else was wacky beyond description and the plot was looser than a wet noodle