Star date 7211, the distant planet Ligaras, is being attacked by alien marauders. The residents of Ligaras are being abducted and turned into mutants. You, as the top gun of the Defender team, must save those people. The aliens are mean and vicious. You must fight with Landers, Mutants, Yllabian Space Guppys, and more. There is a special gate in each screen which you can warp into the other side of the planet. You meet more enemies there to fight. You are the only one who can save the planet. Battle with aliens at the speed exceeding the speed of light, in dark, unknown space!