The Chaos Knights are an elite group of 10 powerful assassins governed by one ruler. Their job is to keep peace in the world by stopping wars and assassinating those who will no doubt cause major disruptions throughout the world and pose a threat towards world peace. But as their old leader, Glen, died, so did his dreams of a perfect justice. The Chaos Knight's new leader, Gaimon, now rules over the world with his warped sense of justice; kill anyone who commits any crime, no matter how minuscule the crime may be. Alexa, the tenth Chaos Knight, breaks free from Gaimon's wretched chains and now plans to fight against him and stop this dark justice. But how will she be able to stop all the Chaos Knights and what was the real reason she turned against Gaimon?

United Offensive follows a similar format to that found in Call of Duty. You play as three Allied soldiers--an American paratrooper, a British SAS commando, and a Soviet infantryman--who are caught in the great struggle against Nazi Germany. Over the course of the single-player campaign, you'll go from the frozen siege of Bastogne during the Battle of the Bulge to the epic German counterattack at Kursk. Throughout most of the campaign, you'll participate in huge, heavily scripted, set-piece battles that make the squad-based battles in Call of Duty look downright minuscule in comparison.