On the Union Aerospace Corporation (UAC) research facility on Mars, Corporal Flynn “Fly” Taggart an ex-space marine who was transferred to the prison system in the (UAC) for shooting and killing a high-ranking officer awakes from his slumber in his cell block where he discovers the entire Facility is deserted. Wandering through the base and finding bloody corpses and human carcasses throughout. He soon discovered part of Mars' moon Deimos is missing. He also finds a sarcophagus along with his Praetor Suit but as soon as he tries to reach it he is attacked by a horde of zombie-like creatures. As he tries to punch his way through the zombie horde defines a pistol and shoots his way through. He is then rescued and reunited by his former comrades; Snookie, Bob, Scott, and Bill who transfer from the Phobos Moon Base. They shoot one of the explosive barrels killing off the zombie horde. But they are led by Lieutenant Kane Sandlers.
