The Shadow Master has consumed all of the resources of his own planet. Now, he is heading to Earth to steal its resources. It is up to you to strap yourself into a space vehicle and defend the planet. Travel to seven worlds, as you undertake 16 missions that will decide the fate of the planet. Along the way, you will have to destroy ceaseless hordes of enemies. Do you have what it takes to save the planet from the SHADOW MASTER?