| Richard Denning | ... | Hank Scott | |
| Mara Corday | ... | Teresa Alvarez | |
| Carlos Rivas | ... | Artur Ramos | |
| Mario Navarro | ... | Juanito | |
| Carlos Múzquiz | ... | Dr. Velazco (as Carlos Muzquiz) | |
| Pascual García Peña | ... | José de la Cruz (as Pascual Peña) | |
| Fanny Schiller | ... | Florentina | |
| Pedro Galván | ... | Father Delgado (as Pedro Galvan) | |
| Arturo Martínez | ... | Major Cosio (as Arturo Martinez) | |
| rest of cast listed alphabetically: | |||
| Bob Johnson | ... | Narrator / Police Radio Dispatcher / Radio Newscaster / Public Address Announcer (voice) (uncredited) | |
Directed by | |||
| Edward Ludwig | |||
Writing credits | ||
| David Duncan | (screenplay) and | |
| Robert Blees | (screenplay) | |
| Paul Yawitz | (story) | |
Produced by | |||
| Jack Dietz | .... | producer | |
| Frank Melford | .... | producer | |
Original Music by | |||
| Paul Sawtell | |||
Cinematography by | |||
| Lionel Lindon | (director of photography) | ||
Film Editing by | |||
| Richard L. Van Enger | |||
Art Direction by | |||
| Edward Fitzgerald | |||
Second Unit Director or Assistant Director | |||
| Jaime Contreras | .... | assistant director | |
| Ray Heinz | .... | assistant director (as Ray Heinze) | |
Sound Department | |||
| Mandine Rogne | .... | sound effects | |
| Rafael Ruiz Esparza | .... | sound (as Rafael L. Esparza) | |
Special Effects by | |||
| Willis H. O'Brien | .... | supervisor of special effects (as Willis O'Brien) | |
| Wah Chang | .... | creator: scorpion puppet (uncredited) | |
Visual Effects by | |||
| Pete Peterson | .... | animator (as Peter Peterson) | |
| Ralph Hammeras | .... | additional effects (uncredited) | |
Music Department | |||
| Jack Cookerly | .... | composer: electronic music | |
| Paul Sawtell | .... | conductor | |
| Bert Shefter | .... | orchestrator | |
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| Tarantula | Them! | The Deadly Mantis | Earth vs. the Spider | King of the Rocket Men |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Horror section | IMDb USA section |
Giant scorpions are unearthed by an earthquake and threaten to attack New Mexico. By the numbers script, but the acting is (surprisingly) good...it's just that the script is VERY dull. And when the giant scorpions (and worms and spiders) are on screen the movie is fantastic. These creatures look terrifying (the close ups of the scorpions' face are not pleasant) and the stop motion animation is superb. So...dull except when the monsters are on screen. Worth seeing for monster fans.