The roxis (enemy) have gathered their resorses on the ten moons of Saturn. Starting on Janus,each successive moon is defended by deadlier troops guarding a more lethal array of weaponry. Only one guy in the universe is brave and foolish enough to try and take them out:l Luke Snayles -convict, ex-pilot,...psychopath. All earth's defence forces have been annihilated,so Snayles is the last hope. Travelling in his small craft and equipped with limited facilities,he must destroy all of the aggressors on each moon,in order to eliminate the installations and progress to the next via a "warp gate". Along the way he can scoop equipment pods to substantially increase his weaponry and other facilities. The mission begins...