In the 6th Godzilla movie, mysterious aliens from the Planet X ask earth’s people to help them save their world from the dreaded Ghidorah (aka “Monster Zero”) by letting them “borrow” Godzilla and Rodan. Monster mayhem ensues on Planet X, but it’s soon discovered that the aliens have other intentions for the monsters.
After a 7 year hiatus, Godzilla returned to the screen to take on King Kong in the 3rd film in the Godzilla franchise. A pharmaceutical company captures King Kong and brings him to Japan, where he escapes from captivity and battles a recently revived Godzilla.
The 9th Godzilla film was the last made by the original Godzilla creators, and was meant to be a grand finale. Aliens have released all the giant monsters from their imprisonment on Monster Island and are using them to destroy earth’s major cities. It is up to the daring crew of the super rocket ship X-2 to infiltrate the aliens’ headquarters before the Earth monsters and King Ghidrah annihilate the planet.