Toho Studios wanted to remake "King Kong vs. Godzilla", which was the most successful of the entire Godzilla series of films, in 1991 to celebrate the 30th anniversary of the film, as well as to celebrate Godzilla's upcoming 40th anniversary. However, they were unable to obtain the rights to use Kong, and initially intended to use Mechani-Kong as Godzilla's next adversary. But it was soon learned that even using a mechanical creature who "resembled" Kong would be just as problematic legally and financially for them. As a result, the film became "Godzilla vs. King Ghidorah", with no further attempts to use Kong in any way.