Winter Soldier

Presumed dead after a World War II mission gone wrong, Bucky Barnes was secretly recovered by the Soviet Union, brainwashed, and transformed into a deadly covert operative known as the Winter Soldier — a ghost assassin deployed for decades against Western targets.

Few Modern Age debuts have hit comics fandom with the seismic force of Winter Soldier, who first materialized in Ed Brubaker and Steve Epting's Captain America #6 in 2005 — a cold, kinetic arrival that instantly signaled Brubaker's run would be something special. Over the two decades since, this figure has proven remarkably durable, racking up 124 catalog appearances across Captain America, Captain America: Sentinel of Liberty, and Thunderbolts, with three of those issues earning key-issue recognition from collectors. The company is always compelling — sharing pages with Steve Rogers, Sam Wilson, Black Widow, and Natasha Romanoff places Winter Soldier at the very heart of Marvel's street-level espionage corner. If you want a character whose debut genuinely changed the shape of modern Marvel storytelling and who has never stopped mattering since, this is exactly where to start.