For millennia, a mysterious figure of terrifying power has persisted across the plains of hell, bringing with him death and distruction. A beacon of good, of light, and of cold revenge. He is known by many names across the cosmos, the destroyer, the slayer, The doom marine. His original name has long since been forgotten, he is known to most simply as the Doomslayer. He once saved the earth from the demonic clutches of hell, this mysterious being now finds himself on a very different version of earth, with its own invaders...

(A Doom Eternal/ Conversion bureau crossover)