While a few pieces were shown here and there in the lead-up to the game's release, what you're about to see is a collection of mostly never-before-seen concept art from the production of one of the year's surprise hits.
Drawing in works from all over the place, from mood-setting paintings to gun designs to ideas on how a certain alien can ruin your mission real fast, it gives you a great idea of what Firaxis' drawing board looked like when coming up with ideas for the game.
Enjoy! Oh, and as a final treat, because many of these are straight from the artists - and not from a PR campaign or game site - most are at sizes you can easily use for wallpaper.
XCOM was released on PC, 360 and PS3 earlier this month. I, uh, rather enjoyed it.
To see the larger pics in all their glory (or, if they're big enough, so you can save them as wallpaper), right-click on them below and select "open in new tab".