Prevent the evil robot Gorf from conquering the entire galaxy! Defeat one fleet and Gorf sends another! First wipe out the Astro Invaders. Succeed, and you'll battle a laser-firing fleet and diving robot ships. Your next mission: tracking and destroying expanding invaders which materialize from out of a SpaceWarp. Defeat them to go on to the ultimate challenge . . . a one-on-one duel against the Gorfian flagship! It's four games in one!