Space Defender is a 3D third person base defence shmup, consisting of progressively difficult waves of enemies, with the player defending the core in the center of the map from enemy space craft that increase in frequency and numbers spawned as the waves consistently increment.
You have discovered a plot to destroy your space station and you ordered all the workers and civilians to depart the station until the threat has been eliminated. It is your job as the captain of the space station to controls an unmanned fighter and desperately trying to stop the enemy bombers from causing enough damage to the space station's power core to cause it to implode, thus causing the shield generator for the space station to deplete so that enemies mother ship can make a final attack to destroy the space station. Good luck Captain!!!