UFO Defence is full of the same exciting and entertaining chemistry that made its predecessor the hit it was. The story takes place on a future Earth, after the Xcom unit has vanquished the alien attackers. Earth has all but stopped funding the agency that was responsible for the destruction of the aliens, but then attacks start occurring, from the ocean.
Earth is thrown back into a war which, like the last one, starts Earth out at a disadvantage.
For those who are not familiar with the original Xcom, it's a great strategy game. This time, as you conquer more aliens, you must dissect them and their technology, learn how to duplicate their technology and then use it against them. Most of all, you will learn about the alien experiments involving humans and discover the secret of where all these aliens came from in the first place. As in the first Xcom, there are many types of aliens and many, many types of technology to study. The objective of the game is actually quite complex.