High Quality Content by WIKIPEDIA articles! UFO: Enemy Unknown (later released under the title X-COM: UFO Defense in the United States and Japan, and also as X-Com: Enemy Unknown on the Sony Playstation) is a critically acclaimed strategy video game created by Julian Gollop and published by MicroProse Software in 1993. It is the first entry in the X-COM series and is often regarded by critics and in polls as one of the best video games ever made.