The XXII century. Our Earth is in danger. The invaders want to capture it and make their colony.
For a long time the Earth was covered with a protective sphere. But the invaders have invented new weapons to destroy the protective sphere...
You have to liberate your planet system from alien invasion using your spacefighter. Player can obtain various extra-weapons and special abilities by destroying enemy cyborgs, fighters and motherships. Each planet has its own cyborgs and bosses.