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.
Alternative titles: Os Monstros do Terror | Assignment Terror | Dracula contre Frankenstein | Frankenstein og blodsugerne | El hombre que vino de Ummo | Reincarnator | Dracula Versus Frankenstein | I symmoria tou Drakoula | Η συμμορία του Δράκουλα | Operazione terrore | Monster Panic: Strange Tactics | Monsutâ Panikku/Kaiki sakusen | Operación terror | Varulven jagar Frankenstein | Ужасные монстры | Dracula vs. Frankenstein | Dracula jagt Frankenstein | Operation Terror | The Man Who Came from Ummo