Darkest of Days is a time-travelling first-person shooter, developed by 8monkey Labs and published by Phantom EFX, hitting retail shelves on September 8th. Players step into the muddy boots of Alexander Morris, a foot soldier who transfers into Custer's regiment days before the Battle of Little Big Horn. Right before he bites the big one, tomahawk style, a time agent warps in and takes him to the future. A rogue agency is trying to change history, and it's up to the player to revisit the famous battles of history to set things right. You'll visit World War I and II, the Civil War, and judging by that screenshot, ancient Rome, though your spear is definitely bigger than theirs.
The game features a new proprietary engine known as Marmoset, allowing for hundreds of NPCs on the screen at once, each acting according to advanced AI, and nifty mechanic where key people who cannot be killed no matter what are highlighted in blue, meaning that running and gunning without thinking is out of the question.
Of course, the best feature is the ability to bring a laser rifle to World War II. Screw temporal paradox.