The main enemy of mankind - the Zilons began a massive invasion of our star system.The Zilon cities manufacture spacecraft, from which the invasion fleet is formed. The player controls a spaceship, with the help of which he/she must ensure the protection of the native star system from enemy fleets. To cope with the invasion, the player will have to skillfully allocate time both for the destruction of the enemy's approaching squadrons and for the destruction of the enemy’s cities. To replenish ammunition and repair the ship, player has to use space stations. To win this war, player need to bomb all the enemy cities and destroy all the fleets. If all the hometowns are destroyed, the player will lose.