In the 24th Century, mankind has entered a new phase of its ongoing development by establishing numerous colonies throughout the galaxy. When one of those colonial outposts, the planet Maris, faces annihilation at the hand of a ruthless alien race known as the Noza, the human colonists' only hope for survival rests in a mysterious alien weapon system known as the Zillion Gun.

With enough of these energy-beam weapons, the Marisians could fend off the invading Noza troops. The problem is that only three Zillion Guns are known to exist, and the alien technology to manufacture more weapons seems unattainable. Thus an elite fighting trio, known as The White Knights is formed to wage a life and death battle for their homeworld's survival. Outnumbered and isolated, things certainly couldn't get much worse…