Star date 7211, the distant planet, Ligaras, is being attacked by alien marauders. The residents of are being and turned into mutants. You as the top gun of the Defender team, must save these 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 can who save the planet, battle with aliens at the speed exceeding the speed of light, in dark unknown space.