Mark Cadmon

A Gerry Conway and Mark Bagley creation who stepped onto the Marvel stage in 1988's The Spectacular Spider-Man Annual #8, Mark Cadmon is a Copper Age figure whose catalog footprint — spanning an impressive 23 years across titles like Marvel Comics Presents and Eternals Annual — speaks to a quiet, persistent presence in the Marvel Universe. He keeps intriguing company, sharing pages with the likes of Caduceus, Sea Witch, and Highnote, a roster that hints at adventures operating in some of Marvel's more eclectic corners. With only ten catalogued appearances, he's the kind of discovery that rewards the dedicated back-issue hunter — a character whose rarity makes each sighting feel like uncovering a hidden gem.