By the year 2190 the Earth is a barren and desolate wasteland. With all natural resources used up, the human race's last hopes rest with a huge orbiting solar power station known as the GRID. Now the GRID has been invaded by a race of evil droids from Frogfax V, intent on the total subjugation of Earth. To combat these droids, an incredibly powerful and manoeuverable ship, the Gridrunner, was developed. Your mission: stop the droids and save the Earth!