: These titles reboot the story, introducing deeper lore about the "Slayer" and his ancient war against the demonic.

: The research facility is quickly overrun by a ferocious demonic invasion. Bases on Phobos and Deimos are transformed into gore-slicked labyrinths, and the staff are either slaughtered or turned into mindless zombies.

: On the moons of Mars, the Union Aerospace Corporation (UAC) has been conducting secret experiments with teleportation technology. In their pursuit of unlimited energy, they accidentally opened a gateway to another dimension: Hell .

: Enthusiasts often use GZDoom to run original game files (WADs) with 3D floors, modern lighting, and thousands of community-made story mods .