X-Com: Alliance is the first person shooter that was set to be based on the Unreal engine. Though it was set back and 'cancelled' twice, although technically the game is just 'on hold'
X-Com: Enforcer was the game that was rapidly churned out in time for christmas the other year when Alliance fell through and didn't complete it's full fun.
X-Com: Genesis was also cancelled. This was to be a 3D major updated twist of the original X-Com: UFO Defence game, UFO: Enemy Unknown to those outside the US (this is where the UFO: Aftermath thing starts).
You can find screenshots of Genesis at the XCommand site here...
http://dynamic.gamespy.com/~xcom/x6x5.shtmlAnd also at Ben Clowards personal website (he worked on Genesis) found here...
http://www.monitorstudios.com/bcloward/port_xcom.htmlRegarding UFO: Aftermath, technically this game isn't part of the X-COM series. X-Com is owned by Infogrames while Mythos games held the UFO title copyrights which was thought wouldn't be needed in future. while Aftermath is supposed to be a sequil to the original UFO (XCOM 1) it technically isn't part of the X-Com series. But it looks like it has a lot of potential, and I for one am looking forward to getting my hands on this game.
And before anyone asks, yes I am an avid X-Com fan
