Doctor Double X

Conjured from the Bronze Age imagination of Mike W. Barr and Rich Buckler, Doctor Double X made his mark on DC Comics with a debut in World's Finest Comics #276 in 1982 — stepping onto pages already crackling with the presence of Batman, Robin, Bruce Wayne, Green Lantern, and The Flash. That's rarefied company for any villain's introduction, and it signals right away that Doctor Double X operates at the upper tier of DC's rogues' gallery. Though his catalog footprint is compact — roughly ten appearances across four decades, including turns in Batman and DC Universe: Legacies — the character boasts a collector-significant key issue and the quiet distinction of a presence that has persisted from the Bronze Age all the way into the current era. For fans who love digging into DC's deeper cuts, Doctor Double X is exactly the kind of discovery that makes the hunt worthwhile.