In an effort to solve an energy crisis on Earth, the Union Aerospace Corporation discovered an infinite source on Mars stemming from Hell itself. Soon after discovery, a scientist corrupted by demonic forces-Olivia Pierce-began experiments with the energy that corrupted humans beyond recognition or upgraded demons into becoming even deadlier than before. A wave of hellish energy was soon sent throughout the Martian base, killing or corrupting every human inside. Left with no options, UAC Chairman Dr. Samuel Hayden opens the long-sealed sarcophagus of Hell's ultimate nemesis: the Doom Slayer. With the Slayer awakened, Hell sends its mightiest and most cunning minions to put an end to the Slayer before he shatters all hope of a victory for Hell's master.
—jking-18526