Ace, Earth's greatest hero, is being attacked by the evil commander, Borf. Borf has just kidnapped the beautiful Kimberly, and is plotting to take over the planet Earth with the help of his dreaded weapon - the Infanto Ray.

Only you can guide Ace through treacherous battles to destroy the Infanto Ray, save Earth and rescue Kimberley. Be valiant, space warrior, the fate of Earth is in your hands!