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.

• Eichberg-Film
• International Jaguar Cinematografica
• Michael Rennie
• Karin Dor
• Craig Hill
• Patty Shepard
• Ángel del Pozo
• Paul Naschy
• Manuel de Blas
• Ferdinando Murolo