Space Invaders 3D

On Earth is coming earthly creatures and want to take over the planet. But is it really all that simple? And can they do it? After all, the world too is desperate head and they will not leave the Earth in danger. Will do all that is in their power, but the enemy does not get to the planet. Today such a situation in the game, and you as a true warrior and a man willing to try to do everything that would defend the planet, and to recreate the world.