Academic researchers are chased by a nuclear-hot specimen of ancient Mayan blob.
| Crew | Mario Bava | Special Effects |
| Editing | Salvatore Billitteri | Editor |
| Camera | Mario Bava | Director of Photography |
| Writing | Filippo Sanjust | Writer |
| Sound | Roberto Nicolosi | Original Music Composer |
| Production | Sam Schneider | Producer |
| Directing | Riccardo Freda | Director |
| Production | Bruno Vailati | Producer |
| Sound | Roman Vlad | Original Music Composer |
| Costume & Make-Up | Filippo Sanjust | Costume Design |
| Production | Massimo De Rita | Production Manager |
| Directing | Odoardo Fiory | Assistant Director |
| Sound | Carlo Rustichelli | Sound Effects |
| Sound | Maurice Rosenblum | Sound Recordist |
| Lighting | Antonio Rinaldi | Gaffer |
| Writing | Riccardo Freda | Writer |
| Production | Lionello Santi | Executive Producer |
| Directing | Mario Bava | Co-Director |
| Editing | Mario Serandrei | Editor |
