In the future, an unnamed marine is posted to a dead-end assignment on Mars after assaulting a superior officer who ordered his unit to fire on civilians.
based
vs.
Teleported to an arena, the Dark Lord and the Slayer fight. The Dark Lord reveals that he was the true creator of the multiverse and that Jekkad (later known as Hell) was the first dimension. The Maykrs, including the Father, betrayed him and rewrote history to depict the Father as the first being, which, in turn, led to the enraged Dark Lord influencing Samur Maykr to turn Doomguy into the Doom Slayer, whose original purpose was to (unintentionally) contribute to the destruction of the Maykrs and the Father, fulfilling the Dark Lord's revenge.
SHUT THE FUCK UPPP