Bucky Barnes
James Buchanan "Bucky" Barnes is a fictional character appearing in American comic books published by Marvel Comics. Originally introduced as a sidekick to Captain America, the character was created by Joe Simon and Jack Kirby and first appeared in Captain America Comics #1 (cover-dated March 1941) (which was published by Marvel's predecessor, Timely Comics). Barnes' original costume (or one based on it) and the Bucky nickname has been used by other heroes in the Marvel Universe over the years. The character is an American Soldier turned Soviet spy and assassin. He was recruited to the U.S. Army during World War II after being a ward of the state. He fought alongside his best friend, Captain America, the "Sentinel of Liberty" and the Invaders, and together they helped the Allies win the war. Bucky was believed to be dead near the end of the war, only to have been found and brainwashed by the Soviets led by Vasily Karpov, who made him the Winter Soldier. He was sent on clandestine missions and committed some of the worst assassinations over the next 50 years. His memory was returned to him decades later and he became the new Captain America after Steve Rogers was seemingly murdered and also joined the Avengers. When Steve returned, he took up the identity of the Winter Soldier once again.
The character is played by Romanian-American actor Sebastian Stan in the Marvel Cinematic Universe movies Captain America: The First Avenger (2011), Captain America: The Winter Soldier (2014), Ant-Man (2015), Captain America: Civil War (2016), Black Panther (2018), Avengers: Infinity War (2018), and Avengers: Endgame (2019), the miniseries The Falcon and the Winter Soldier (2021), the animated series What If...? (2021), and the upcoming film Thunderbolts (2024).