Year 2947. Earth is invaded by the evil k'caj clan from the Yenrut galaxy. You are the galactic Commander Frank Drexor. The United States Security Space has entrusted you with the task of defending the most important sector of the galaxy from invaders. The technology of the k'caj is much more advanced than that of Earth. Some of the ships had tractor beams. Others are equipped with subspace energy disruptors. Disruptors create energy barriers that actually cause cannon shots to reflect back at you! If your mission fails, the K'caj will gain control of this crucial sector of space, allowing them to maneuver their troops and vehicles much more efficiently and gain a larger foothold in the battle for the planet. This, of course, would be a disaster for the inhabitants of the Earth. Their fate is in your hands!