Warhammer 40,000: Space Marine is a third-person shooter game developed by Relic Entertainment and published by THQ. It was released for Microsoft Windows, PlayStation 3 and Xbox 360 on September 6, 2011, in North America and September 9, 2011, in Europe.
The game takes place in Games Workshop's Warhammer 40,000 universe and features the Ultramarines chapter. Its gameplay focuses on a hybrid shooting and melee combat model. It was Relic's first game released on a PlayStation platform (their first console release in general was 2006's The Outfit).
The game's plot line involves the Forge World Graia (a planet devoted to military production) that has been invaded by alien Orks. The game follows a Command Squad of three of the Ultramarines, 2nd Company Commander and playable character Captain Titus, his immediate subordinate Veteran Sergeant Sidonus, and a relatively inexperienced and by-the-book Tactical Marine named Leandros.
Initially upon arrival the squad provide assistance to the outnumbered and overrun Imperial Guard regiments fighting on the planet's surface, which after the loss in battle of all higher-ranking officers are now being led by the sole surviving junior officer, Second Lieutenant Miranda 'Mira' Nero; she informs Captain Titus of the present situation and briefly accompanies the squad to their next waypoint.
Titus agrees to silence the captured planetary defense cannon which has been preventing supply ships from reaching the beleaguered defenders. This done, Mira thanks the Space Marines and continues to help Titus however she can over the course of the game, amidst re-organizing the remaining Imperial Guard forces and attempting to hold the majority of the invading hordes at bay until the delayed reinforcement fleet arrives. The Space Marines then move on to continue with their own mission and, amidst securing the Titan Invictus (one of a class of giant, bipedal war machines that are produced primarily on Graia and the principal reason for the Ultramarines' deployment there), answer a distress call from the injured Imperial Inquisitor Drogan, from whom they learn of a weapon that can wipe out the Orks, but which needs a power source that is located in a reactor below the Manufactorum...
In Space Marine, the player engages enemies with both melee and ranged from a third-person point of view. The player character, Titus, has regenerative abilities. When his health gets low, performing some actions can allow Titus to regain a portion of his health. Titus is accompanied by the characters Sidonus and Leandros for most of the missions, though some missions are performed alone. The game features a fury meter that, when filled up, allows the player to either slow time for aiming or perform powerful melee attacks.
The starting weapons include a combat knife and a pistol, though the player can acquire other weapons. The game also includes a new weapon not featured in the table-top game known as the Vengeance Launcher, which can shoot sticky grenades.
The game's main antagonists are the Orks and the Forces of Chaos. The Orks are an alien race of brutish warriors. The Forces of Chaos are an even greater threat, and can summon monsters that live in a parallel dimension known as The Warp. Portals conjured by the Traitor Legions allow daemons to enter the battlefield.