Orion invaders have reached our peacful planet. It is your mission to counter attack them and follow them to their lair in Dimension-X.Your day to save the world has come!Orion invaders have reached our peaceful planet! It is your mission to counter attack them. To aid you in your mission, the leaders of earth have given you X-Avenger, a cutting-edge hi-tech spacecraft. Blast your enemies with tons of missiles and energy-based weapons. The peace of all humanity rests in your hands!