Guardian

Guardian made their Marvel Comics debut in the pages of Avengers: The Initiative #1 in 2007, brought to life by the acclaimed creative team of Dan Slott and Stefano Caselli during one of Marvel's most ambitious Modern Age expansions. Though their catalog footprint is compact — just five appearances spread across Avengers: The Initiative, Incredible Hercules, and Marvel Comics Presents — one of those issues carries genuine key-issue status, making Guardian a name worth flagging for the sharp-eyed collector. Along the way, this character shares the page with some of Marvel's heaviest hitters, including Iron Man, Ms. Marvel, and the Wasp, placing Guardian squarely within the high-stakes superhero landscape of the late 2000s. A focused, rewarding dig for fans who love uncovering the Modern Age's overlooked corners.