Aliens from a dying world plot to conquer earth by praying on man's superstitions. Bringing two dead scientists back to life, they use their knowledge to re-animate various earth monsters, including the werewolf, Frankenstein's monster, the mummy Tao-Tet, and the vampire Count de Meirhoff.
Unfortunately the movie Assignment Terror is not yet available on HBO Max.
| Art | Adolfo Cofiño | Set Decoration |
| Directing | Tulio Demicheli | Director |
| Production | Jaime Prades | Producer |
| Camera | Godofredo Pacheco | Director of Photography |
| Writing | Paul Naschy | Screenplay |
| Editing | Emilio Rodríguez | Editor |
| Directing | Eberhard Meichsner | Co-Director |
| Directing | Antonio Isasi-Isasmendi | Co-Director |
| Directing | Hugo Fregonese | Co-Director |
| Sound | Franco Salina | Original Music Composer |
| Sound | Rafael Ferrer-Fitó | Original Music Composer |
| Writing | Paul Naschy | Story |
| Production | Victor Tarruella Lacour | Associate Producer |
| Costume & Make-Up | Francisco Ramón Ferrer | Makeup Artist |
