Flatman

Flatman is a Marvel hero with the mutant ability to flatten his body to a two-dimensional state, allowing him to squeeze through tight spaces and glide through the air. He is a core member of the Great Lakes Avengers alongside teammates like Big Bertha and Doorman.

Flatman made his Marvel debut in The Avengers Annual #19 in 1990, arriving at the tail end of the Copper Age with a name that tells you exactly what kind of delightfully offbeat corner of the Marvel Universe he inhabits. Over more than three decades of publishing history stretching into 2026, he's carved out a niche as one of comics' most charmingly unconventional figures, sharing pages with the likes of Big Bertha, Doorman, Craig Hollis, and Ashley Crawford — a roster that signals he runs with some of Marvel's most wonderfully quirky ensembles. His appearances across Avengers West Coast, Avengers: The Initiative, and the Avengers Epic Collection speak to a surprising longevity for a character who could easily have been a one-off joke, and the fact that one of his appearances carries key-issue status makes him worth a second look for any serious collector. If you love the stranger, more irreverent side of Marvel storytelling, Flatman is exactly the kind of hidden gem that rewards digging through longboxes.