Warhammer 40,000: Space Marine takes place in the brutal, science fiction setting of Games Workshop’s Warhammer 40,000 universe. In the 41st Millennium, humanity faces extinction at the hands of horrific aliens and demonic hordes. Only one force offers salvation, the superhuman Space Marines. Warhammer 40,000: Space Marine is an intense action-blockbuster experience that allows you to step into the armor of a merciless Space Marine and use a vast array of guns & melee weapons to crush overwhelming alien forces in quest to save humanity.
The gameplay experience of Warhammer 40,000: Space Marine focuses on a hybrid shooting & melee combat model. This provides a seamless, free-flowing control system that allows the player to instantly switch between shooting and melee to deal with the immediate threat. Delivering a reflex-driven combat system that empowers the player to carry the momentum and cadence of battle in an intensely satisfying experience.
Source: Wikipedia, "Warhammer 40,000: Space Marine", available under the CC-BY-SA License.