 In the year 1999, all the Earth s giant monsters (Godzilla, Rodan, Mothra, Angilas and Minya, among others) are incarcerated on a small island near Japan. The Kilaaks, a race of aliens from a small planet somewhere in the asteroid belt, release the beasts and send them to trample the cities of our world. An Earth spaceship must penetrate the aliens  moonbase and take control of the monster army before a final confrontation with the space dragon King Ghidrah.