In the year 20XX, an alien spaceship arrived in the city. The aliens used the virus to transform the animals into robots. The aliens wanted to rule the world, and the humans tried to fight them. The wars between the aliens and humans were fierce and brutal. The humans were forced to live in the underground tunnels, while the aliens occupied the surface. The wars lasted for many years and the humans were only able to fight the wars with the help of a special gun. This gun was created by the best gunmakers in the world. The name of this gun is the “Mark II”. You will face the toughest missions with the help of this gun. You will have to fight the toughest enemies, including the alien robots and the alien-controlled robots. You will need to destroy all the enemy robots. In order to survive, you will need to adapt to the new environment. You will need to build new buildings, vehicles, and weapons. The game will allow you to build and destroy the vehicles. The enemies will be the toughest challenge. They will come in different forms and sizes. You will need to adapt to the new environment.