The character has appeared or been referenced in Mark Millar's works Marvel 1985 and Kick-Ass, and his runs on Fantastic Four and Old Man Logan.
[2][3] After he accidentally resurrects his dead father, his mother hits him with a candlestick, leaving him with brain damage.
[4] Subsequently, Reed Richards has Clyde placed in a holding cell in Area 87 and creates a cybernetic helmet to placate him.
He is immortal and can open portals to other dimensions/realities, time travel, resurrect the dead, manipulate matter, shapeshift, teleport, generate massive amounts of energy, project telepathic illusions, and mind control high-level cosmic entities.
The Marquis of Death is a future incarnation of Clyde Wyncham from Earth-807128, where he escapes Area 87 and has his mind restored.