UFO: Aftershock is a real-time tactics/turn-based strategy video game developed by Altar Interactive and released by Cenega Publishing in Europe and Tri Synergy in North America in 2005. It is a squad combat game at its core with overlying strategic elements inspired by the 1994 classic X-COM: UFO Defense, though less than its own 2004 predecessor, UFO: Aftermath. It was followed by UFO: Afterlight in 2007. (wikipedia.org)