Great Monster War of Earth

The Great Monster War of Earth is an event that occur prior to the events of Monster Kid. It was a conflict between Zero, an army of his giant monsters from another dimension and an ancient civilization as well as an alien race called the Blight and the Ancient Ones.

Pre-Monster Kid
Millions of years ago during the are of an ancient civilization, Zero arrived on Earth and cause great destruction, unleashing an army of monsters called Solar Monsters to conquer and terraform the entire planet.

Aftermath
During the final battle, Zero was defeated by the prince of the Star Empire and retreat back to the Solar Dimension. The Blight and the Ancient Ones return to space while the Star Empire use their technology to restore the Earth.