 The idea for this movie was spawned by Willis OBrien, who had done  the special effects for _King Kong (1933)_ (qv). In the late 1950s,  he tried to drum up interest in a sequel to be titled King Kong vs.  Frankenstein. The Frankenstein would have been a giant monster  created from different animals. Unable to find an American studio  interested in the project, producer John Beck offered the idea to  Toho who replaced Frankenstein with Godzilla.