Army of Ages
In this game you must fight off the alien invasion attacking the planet. Start out during the Stone Age. Build an army and a good defense to attack the enemy and defend your stronghold. Certain units have special abilities that you can use to your advantage. Some can attack from the ground or the air, or can attack long range. Gain experience points by fighting enemies, then evolve to the higher ages, such as the medieval ages and classical periods. Evolve up to the space age and use your weapons and troops to defeat the alien enemy.