A mysterious distress signal calls your team—two hardened Marines and a rookie scientist—to a Union Aerospace Corporation research facility on Earth’s Moon, but you were unprepared for what awaits you. The forces of Hell itself have taken hold of the station and its inhabitants! Zombies and demonic monsters roam the halls, killing all who cross their path. Your backup squad is dead. Mysterious scientists conspire against you. Even the facility’s AI cannot be trusted. You are being hunted from all sides. Now, you must fight to survive, and try to stop the invasion—and uncover the truth—by any means available. The fate of all humanity is at stake!