Doctor Julius Schwartz

A curious name to find in the Marvel Bronze Age, Doctor Julius Schwartz stepped onto the page in The X-Men #98 in 1976, courtesy of the legendary creative partnership of Chris Claremont and Dave Cockrum — right in the thick of the title's most celebrated era. With only a handful of catalog appearances, this is a rare, blink-and-you'll-miss-it figure whose issues place him alongside some of the most iconic mutants in comics history: Kurt Wagner, Ororo Munroe, Logan, and Colossus. For dedicated Uncanny X-Men completists, tracking down a character this obscure from such a landmark period is exactly the kind of deep-cut treasure that makes Bronze Age collecting so rewarding.