Ion

Brief but intriguing, Ion stepped onto the Marvel stage in 1991 courtesy of the creative team of Mark Gruenwald and Larry Alexander, debuting in the pages of Captain America — one of Marvel's most storied titles. A Copper/Modern Age figure with a compact but notable footprint, Ion moves in genuinely compelling company, sharing adventures with the likes of Diamondback, Knockout, and the enigmatic Machinesmith across Captain America and Quasar. With only a handful of catalog appearances, Ion is precisely the kind of discovery that makes digging through early-'90s Marvel back issues so rewarding — a rare gem for the dedicated collector.