Godzilla: Monster of Monsters
The invaders from Planet X attack Earth to conquer the entire universe with a legion of space monsters. Earth sends Godzilla, the strongest monster on Earth, and Mothra to defend itself. Godzilla goes through 8 stages of battle to defeat a legion of space monsters controlled by Planet X. For the future of the Earth now begins Godzilla's fierce battle...
Story
The mysterious Planet X appears as Pluto and Neptune swap positions in the solar system, and its inhabitants attempt to conquer Earth using a legion of space monsters (some of which are actually from Earth) as their main attack force. The king of the monsters, Godzilla, joins forces with the protective monster Mothra and the forces of Earth to repel the invasion.