Volcanic activity frees giant scorpions from the earth who wreak havoc in the rural countryside and eventually threaten Mexico City.
| Directing | Edward Ludwig | Director |
| Writing | Robert Blees | Screenplay |
| Writing | Paul Yawitz | Story |
| Writing | David Duncan | Screenplay |
| Art | Edward Fitzgerald | Art Direction |
| Camera | Lionel Lindon | Director of Photography |
| Production | Frank Melford | Producer |
| Visual Effects | Willis H. O'Brien | Special Effects Supervisor |
| Sound | Paul Sawtell | Original Music Composer |
| Visual Effects | Wah Chang | Creature Design |
| Production | Jack Dietz | Producer |
| Visual Effects | Pete Peterson | Animation |
| Visual Effects | Willis H. O'Brien | Visual Effects |
