Slim

A lean slice of Marvel's Silver Age spy world, Slim made their debut in Strange Tales #136 in 1965 — right in the thick of the era when Stan Lee and Jack Kirby were electrifying comics with Cold War intrigue and globe-trotting adventure. With a handful of appearances spread across Strange Tales and Nick Fury, Agent of S.H.I.E.L.D., Slim moves through a remarkably charged corner of the Marvel universe, sharing pages with the likes of Gabe Jones and Laura Brown. Small in number but not in significance — one of those appearances carries key-issue weight — Slim is exactly the kind of hidden gem that rewards the dedicated collector digging deep into Marvel's espionage-flavored Silver Age.