Set in a grim, dark future, Warhammer 40000: Space Marine follows the story of a genetically-engineered super-soldier known as a Space Marine. Raised by human parents on Mars, the protagonist is tasked with defending humanity from threats both within and without.
The game is an action-adventure title that sees you control your Space Marine character through various levels set on different planets. Your mission is to complete objectives while battling against enemy forces, using a combination of melee combat and advanced power attacks.