Well except the thing that UAC has a military wing and the director of that division is actively working to weaponize demons. Humanity enters a period of peace, no one fights or wants for resources, UAC now provides the entire needs for the entire human race from mars. 3, converting hell energy in to human energy. 2, keeping the occasional demon presence in check. UAC settles in and over decades masters several things. Until the UAC moves in and discovers that the border between the human realm and demon realm is uniquely weak on mars and that a limitless energy source trickles through said weak borders. Mars is colonized, but largely meh to humanity.

The really really deep dark things in hell even came to the surface and challenged him, we're talking demons that would of made god hesitate.Д®ventually he entered a massive unholy church, the demons literally brought it down on him and then sealed his body in a sarcophagus with warning scribble all over it saying 'do not open. Demons fled deeper and deeper but were systematically being eradicated by this holy knight. He hunted, killed and did it so damn well that hell's legions could not stop him. A holy knight descended upon hell and routed it. Note : this is the story as I understand it, I did pay attention to it but could be wrong. The story follows the break so don't click this article unless you want to be spoiled!. I got everything that follows from simply listening to the narrative as objectives were sent my way and in particular from the small interactive tablet things in hell where a Demon actually explained things. Doom actually has quite abit of story to it, even without the need of reading all the collected pda tablets in the game. 14hrs, easy difficulty, did not actively chase collectibles/side objectives.

Doom shut down the portal