Are All The Doom Games Connected?

thegamer.com:

There have been a lot of Doom games over the years, and the series has only gotten better as it's gone along. Those who haven't played the games might assume that each new release, especially Doom 2016, was just a remake of the original, albeit with improved graphics, new monsters, and more features.

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But there is an over-arcing story to the series that interweaves a grand narrative of id Software games and creates a dense and interesting timeline across two video game universes. There's a lot of information to trawl through, but here’s a condensed look at the timeline of the Doom games and how they’re all connected.

To start things off, yes, all the Doom games are connected, or at least are part of parallel timelines and alternate universes. Each game is part of an ongoing story of the Blazkowicz family (yes THAT one) and their heroic battles with evil. Be it Nazis in Wolfenstein or in the case of Doom, the innumerable forces of Hell.

According to Tom Hall and John Romero, several id Software games are connected, and every Doom Guy originates from Commander Keen, who in turn is the grandson of William J. Blazkowicz, the protagonist of the original Wolfenstein. Which makes each Doom Marine a Blazkowicz family member in one shape or form, be that grandson, great-grandson, cousin, or, in one case, clone. They've been doing the family business of kicking ass for a long time.

Though the Doom games are set in the far future, and a few spin-offs are considered to be non-canon, the overall story you can piece together is pretty interesting. It portrays an ancient inter-dimensional war with Hell's demons, humanity's hubris, and the machinations of a malevolent alien race