"Doom Eternal is the sequel to Doom 2016, in which we step back into the chunky, elephantine boots of THE DOOM SLAYER, and the plot picks up where Doom 2016 left off, give or take an explanation for how we escaped from Mars, and where we got a fucking spaceship from, or how demons have conquered most of Planet Earth. Okay, so maybe it doesn't start where Doom 2016 left off, although the "demons invading Earth" bit, we could probably have safely assumed. Ooh, what has humanity learned from the previous disaster? The usual amount: somewhere in the region between "bugger" and "all". How timely. But as for how THE DOOM SLAYER got here, maybe that was explained in the DLC or a comic book somewhere; and incidentally, I do appreciate how it's now canon that THE DOOM SLAYER does actually talk like he did in the Doom comic book: like an abattoir worker on enough coke to floor an elephant seal."