Aliens are headed for planet Earth, and these little green men aren't the friendly sort. In a speedy, armed spaceship, you're ready to get between the enemy and the planet and defend Earth with all you've got. In each level, take on rows of enemy ships by flying back and forth, avoiding their lasers and shooting your own in their direction. After you make it through the mass of pawns, you'll have to take on their bigger, stronger boss. Your ship is tough, but each time you get hit you lose a life, and if you lose all three lives the aliens win. Fly your best and shoot to kill to rack up points and save the planet.