You just finished the space academy and are ready to join the Space Guards, an union for protecting scientific research of the cosmos. The first task is to protect the space station X5, which is directed by the brilliant young scientist, Dr. Sophia Cardes. It becomes clear that mankind is at war. Under all circumstances an evacuation is to be avoided but how long can you remain? You control the weapons with both hands, one hand on the cursor keys to rotate the base and the other on the mouse to aim and shoot.