Ultimate Galactic Battle

The aliens are here and the Ultimate Galactic Battle the Earth is starting. As a member of a crew designated by the United Nations you have to go into space and stop the alien invasion. The Earth is the last planet who can keep the equilibrium of the universe so the success of your mission is vital. The enemy ships are coming in four different campaings where you have to defeat different races of rebel aliens. After you defeat an alien race you can steel it's weapon technology and use it in the following campaigns. Good luck and have fun!