Crimson Cowl

Few Silver Age mysteries landed with quite the intrigue of Crimson Cowl, who slipped into Marvel lore through the pages of The Avengers #54 in 1968 — a key issue and a genuine collector's prize, crafted by the legendary team of Roy Thomas and John Buscema. This enigmatic figure shares the Avengers' world alongside the likes of Edwin Jarvis, Ultron, and Janet Van Dyne, which tells you something about the high-stakes company this character keeps. An Avengers-affiliated presence across a surprisingly long stretch of Marvel history — from the Silver Age all the way into 1990 — Crimson Cowl may have a slim catalog footprint, but every appearance carries real weight for fans who love the shadowy corners of Marvel's most iconic team.