Madcap

A survivor of a Hydra chemical attack that killed everyone else on his bus, the man now known as Madcap was doused in an experimental compound that left him virtually indestructible and stripped him of his sanity, giving him the power to inflict wild, unhinged behavior on anyone he looks at.

Bursting onto the scene in Captain America #307 in 1985, Madcap is one of the more gloriously unhinged figures to emerge from Marvel's Bronze Age — a wild card whose unpredictable energy has kept him popping up across four decades of storytelling. Created by the legendary Mark Gruenwald and Paul Neary, he's rubbed shoulders with some of Marvel's heaviest hitters, sharing pages with Captain America, Iron Man, and the Vision, while finding a particularly fitting home alongside the chaos of Deadpool: World's Greatest. A member of the Serpent Squad with a collector-notable key issue to his name, Madcap is the kind of cult figure who rewards the curious fan — 25 appearances spanning from 1985 all the way to 2026 prove that Marvel keeps finding reasons to bring this gleeful agent of mayhem back into the mix.