If you’re talking about Doom, it’s the original Doom game
Sorry but you’re not the arbiter of worldwide speech, so you don’t get to decide that. The name of the 2016 game is just Doom. If there’s a chance of confusion you can add (2016) for clarity, as I did, but it really has the same title as the original Doom game and there’s nothing wrong with just calling it Doom. Which it is.
First of all, there really isn’t all that much story to the original Doom. There are a couple of paragraphs in a readme.txt file tucked away in the installation folder, and an ending screen after each episode… but that’s basically it.
As I understood it, Doom 2016 is a re-imagining of Doom, so the universes are not canonically linked. Kinda like how The Thing From Another World (1956), which takes place in Alaska, isn’t canonically linked with The Thing (1982) which takes place on Antarctica.
The original DOS version of Doom runs at 35fps, exactly half of the 70Hz refresh rate of 320x200 VGA mode. I thought it felt really smooth back in the day, but it does feel weird and stuttery on modern systems when played through Dosbox. I get used to it after a bit, but still.
Fortunately as Doom is open source, there are many enhanced Doom ports that lift this 35fps limit and allow it to run on modern machines without emulation. I usually play in GZDoom which can run at the max refresh rate of my monitor (144Hz), so it feels silky smooth.