In the year 1999, all of Earth's monsters (Godzilla, Minilla, Rodan, Mothra and Anguirus, among others) are incarcerated on a small island chain near Japan. The Kilaaks, a race of aliens from a small planet located somewhere in the asteroid belt, release the beasts and send them to trample the cities of our world. An Earth spaceship named Moonlight SY-3 must penetrate the aliens' Moon base and take control of the monster army before a final confrontation with the space dragon King Ghidorah.
—David Thiel <d-thiel@uiuc.edu>