UFO: Enemy Unknown

UFO Enemy Unknown puts you in command of XCom, with the finest Earth technology at your disposal to defend the Earth from alien invasion. Shooting down UFOs is just the beginning. You will then control a squad of heavily armed soldiers, edging cautiously through the local terrain, battling aliens and recovering UFO technology.
When you command a ground assault, you will use the 3-D isometric 'Battlescape' display. This shows terrain, buildings, XCom craft and UFOs, but will only display what your soldiers can see so beware of danger lurking around corners or down dark corridors!
Successful ground assault missions mean that XCom scientists can research alien technology. Engineers can then reproduce their superior weapons and spacecraft. Soon you will be fighting the aliens with their own technology.
As the game progresses, you will use the on line 'UFOpaedia' to learn the latest details from your research teams about alien technology, life forms and their real objectives. Above all, you must watch the world political situation. Look out for governments who may be forced to make secret pacts with the aliens and make sure you defend the countries who fund XCom heavily.
UFO Enemy Unknown. Command Earth's forces against the alien terror!