Sell Xbox 360 Games. Get Cash for XCOM: Enemy Unknown. What you think you know about the enemy is about to change. An insidious and faceless enemy is clawing its way into America, tearing at the fabric of the American dream. This is not an invasion that anyone could have expected or prepared for. There is no army, no front – only a nation being picked apart from within, one family at a time. Join humanity’s struggle against an unknown enemy and step into the shoes of William Carter, an FBI agent tasked with identifying this mysterious growing threat and eliminating it at any cost. True to the roots of the franchise, players will be placed in charge of building a campaign of risky strategic gambits to overcome high-stake odds. Told from a first-person perspective, they will enact their plans through heart-stopping combat experiences that pit human ingenuity – and frailty – against a foe beyond comprehension. Players will feel the white-knuckle tension and fear that comes with confronting an elusive and deadly enemy across battle lines drawn through the homes and lives of the innocent.