Aliens from a dying world plot to conquer earth by praying on man's superstitions. Bringing two dead scientists (Michael Rennie and Karin Dor) back to life, they use their knowledge to re-animate various earth monsters, including the werewolf Waldemar Daninsky, Frankenstein's monster (both played by Jacinto Molina), the mummy Tao-Tet, ...
After Jonathan Harker attacks Dracula at his castle, the vampire travels to a nearby city, where he preys on the family of Harker's fiancée. The only one who may be able to protect them is Dr. van Helsing, Harker's friend and fellow-student of vampires, who is determined to destroy Dracula, whatever the cost.