As the game name suggests, story of game is based on aliens attack. The story is that the aliens have invaded the planet Earth. It has become necessary to save our planet from aliens, so a hero rises to fight back. Hero has to kill the aliens and force them to leave the planet Earth. It is not easy mission to complete as he has to go for a long journey alone.

Game has bunch of new guns with different powers. This guns can be very helpful for our hero to accomplish the mission. On the way hero can also collect coins and mystery box that has different power-ups like extra health, shield, etc. Coins are needed for buying guns in shop.