Sergeant James Buchanan "Bucky" Barnes is a fictional superhero appearing in American comic books published by Marvel Comics. The character was created by Jack Kirby, Ed Brubaker, Joe Simon and Steve Epting and has been portrayed by Sebastian Stan in the Marvel Cinematic Universe.
Barnes was a former soldier of the 107th Infantry Regiment and the childhood best friend of Steve Rogers. During an attempt to capture HYDRA scientist Arnim Zola, Barnes was caught in an ambush and plummeted from the HYDRA train, where he vanished and was then presumed to be deceased.
Unbeknownst to his team, Barnes had actually survived the attack on the train, albeit with the loss of his left arm. Brainwashed and armed with a new cybernetic limb, he ultimately became an enhanced HYDRA operative known as the Winter Soldier.
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