The action of Space Marine takes place in the gothic science fiction universe of Warhammer, in the 41st millennium. Humanity is in a grim, perpetual war with lurking alien races. At the same time, the civil war among humans makes the situation even more difficult. Take on the role of Captain Titus of the Ultramarines and save humanity from the Orcs and the dark forces of Chaos. Remember, your goal is not to repel the enemies, but to charge at them and crush them!