RELATED: Doom: 5 Video Game Heroes Doomguy Can Beat (& 5 He Cant). But at the end of the game, Samuel Hayden, head UAC scientist and cyborg, betrays the Doom Slayer and chucks him into an alternate dimension that turns out to be Quake Champions. Now that Doom Eternal has been out for some time and everyones had a chance to endure its punishing difficulty, its time to ask the prime question thats on everyones mind: How do the likes of the Icon of Sin and The Gladiator fair up to the other bosses in the Doom franchise. Eventually he defeats head Hell cultist and UAC scientist Olivia Pierce. He wakes up after everything has gone to Hell (literally) and kills his way to victory on Mars, yet again. One of them finds the Doom Slayer and brings him back. In an attempt to better understand and harness Argent energy, the UAC is sending expeditions into Hell. They have discovered Argent energy via portals to Hell (though they aren't telling anyone that last part because, presumably, humans in this game universe have read Faust or seen The Devil's Advocate).

Mars has colonies again, and the UAC is running them. When Doom 2016 starts, Earth is basically okay except for a pretty serious energy crisis. Here's where the timeline gets a pretty hardcore retcon (though there are some decent fan theories that suggest the original Doom universe is an alternate dimension or timeline than the Doom 2016 universe).

Icon of sin doom 3