In "DOOM Eternal" Sometime after the events on Mars, Earth has been overrun by demonic forces, wiping out most of the planet's population, under the now-corrupted Union Aerospace Corporation. What remains of humanity has either fled Earth or have joined the Armored Response Coalition, a resistance movement formed to stop the invasion, which has gone into hiding after suffering heavy losses. The Doom Slayer, having previously been betrayed and teleported away by Dr. Samuel Hayden, returns with a satellite fortress controlled by the AI VEGA to quell the demonic invasion by killing the Hell Priests.