Yet again earth is under attack by the slimelords of Xtharrgg. The positive is that a few of the very latest Vorton Hyper X-13 UltraStarfighters are at hand, the negative, the only pilot good enough to fly them is you! Super Grid Runner was an iteration of Llamasoft's popular Gridrunner series for next generation computer families of the day, starting with the Atari ST. While this version includes new sprites, graphic effects and a new power up system, the game remains faithful to the original VIC-20 classic.