Bucky Barnes

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James Buchanan "Bucky" Barnes is a fictional character portrayed by Sebastian Stan in the MCU world. Barnes is childhood best friends with Steve Rogers and serves alongside him in the Howling Commandos during World War II. Barnes is seemingly killed in action but is actually captured by elements of Hydra within the Soviet Union. He is brainwashed and transformed into a super soldier with a metal arm known as the Winter Soldier. In their quest for world domination, Hydra uses a programmed Barnes as an assassin throughout the 20th century. Bucky has nigtmares about Hydra and healways hurts himself after a failed mission because Hydra used to do it and calls you doll.