In 2163 fourteen years after the events on Mars Earth has been overrun by demons wiping out 60 of the planets population The Union Aerospace Corporation UAC has been fully corrupted into a demonic cult What remains of humanity has either fled Earth or joined the Armored Response Coalition ARC resistance movement The Doom Slayer having previously been betrayed by Dr Samuel Hayden returns with a satellite fortress controlled by the AI VEGA to quell the demonic invasion by killing the Hell Priests
