...After an unexpected attack by the aliens, a long and exhausting war has followed. The Earth defenders have no manpower to continue the resistance. There is only one chance left. This chance is you. You are to fly a small single-pilot spacecraft directly inside the alien command center and destroy their Main Brain. After you do this, the aliens will become disorderly and fearful. This is the only way to save planet Earth. Good luck, pilot. You'll need it.

The right game for those folks who like to save Galaxy at their leisure!