Juuryoku Soukou Metal Storm (Japan)

About

In the year 2501, mankind has colonized the Solar System, but all is not well. On a defense outpost on Pluto, a robot-controlled laser gun built to protect Earth from alien invaders has begun to malfunction. It has turned against the human race, and begun destroying the Solar System. Most recently, the people of Earth watched helplessly as Neptune was destroyed. Attempts to activate the station's self-destruct system have failed. In a last ditch effort, the player must storm the Pluto base with the most sophisticated weaponry available, the M-308 Gunner, and enable the self-destruct device.[1][3] After the final boss is destroyed, the leaders of Earth grant the M-308 Gunner immortality, with the duty to protect mankind from future threats.[4]