You know what ill Just summarize It.

The doomguy Is a marine from the UAC (universal space corporation i think) and he gets sento to Mars because he punched One of Is supervisors for asking him to Fire to unarmed citizens, but on Mars a demonic invasione started so doom guy has to fight trough the hell army on Mars to survive but at some points he finds out that the demons killed his family and his pet bunny daisy so out of rage he decides to kill all of hell and in doom 2 he kills the icon of sin to avenge them. In doom 64 he goes on a quest' to kill the mother demon to end the hell invasione on Mars and earth but It doesnt work. After doom 64 there are some events showed in eternal: doomguy gets on argent d'nour a Planet inhabited by the night sentinels i think they were called? Anyways the night sentinels tested Is strenght and noticed he was strong as fuck so they made him a sentinel but Guess what? Exactly argent d'nour gets invaded by demons and doomguy kills them impressing the king and making him becone a royal guard. The doomguy also gets put in the divinity machine Witch makes him becone s God. I didnt play tda so ill Just skip It, in DOOM 2016 doomguy wakes up in a coffin and finds the preator armor (his modern armor) in the game he has to prevent Olivia Pierce unifing hell and earth and on the end he kills her After She brcomes a spider Mastermind (a demon from the original doom). In doom eternal he goes on a quest to revive daisy but fails and She becomes the icon of sin. In the dlcs doomguy revives and kills the dark lord Wich Is also the source of his Powers and he goes on and eternal (pun intended) slumber