![]() | Archaeologists investigating some Mayan ruins come across a blob-like monster. They manage to destroy it with fire, but keep a sample. Meanwhile, a comet is due to pass close to the Earth - the same comet passed near the Earth at the time the Mayan civilization mysteriously collapsed. Coincidence? |
| John Merivale | - | Prof. John Fielding |
| Didi Sullivan | - | Ellen Fielding |
| Gérard Herter | - | Max Gunther |
| Giacomo Rossi Stuart | - | Prof. Rodríguez's Assistant |
| Vittorio André | - | Prof. Rodríguez |
| Daniele Vargas | - | Bob |
| Arturo Dominici | - | Nieto |
| Nerio Bernardi | - | Police Inspector |