The mad Colonel Red has discovered four crystals that imprison a deadly being known as GoldenSilver, and plans on unleashing it onto the population of the planet! He must be stopped!

The distant planet of Gunstar 9 has enjoyed a peaceful and prosperous history, so the last thing the inhabitants expected was an alien attack. And now it has happened. With the military rendered useless by the attackers, the planet is in need of some Heroes to save the planets and prevent the total annihilation of Gunstar 9. This is where you come in, as one of two brothers, you must destroy the evil that has infiltrated your planet before it's too late. You've got a 360-degree firing radius, and you're going to need it to handle the hordes of enemies that will bombard you with all kinds of weapons and traps.

Unleash some mad blasting action onto the Colonel's army and don't let him bring GoldenSilver to life!! The fate of Gunstar-9 is in your hands!