In 2191 AD, planet Earth has been recovered after a long war that it caused million of casualties. Ruled by Master Computer, people lead a pacific existence until that a day, an alien race attacks Master Computer to control it. Malfunctioning, Master Computer launches an attack simultaneous to the six sectors of the megalopolis. No options, Chief of Security summons Nova, a lord of the ancient Power Blade (a special boomerang with high destructive capacities), to defeat the aliens and recover Master Computer. *You* travel across the six levels, increases your boomerang's power, finds your contact, locates the armor suit, get the ID Card, destroys the bosses of each level and ready to confront with alien leader. You are the only one hope to save planet Earth!