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Private Bucky Barnes was Steve Rogers, AKA Captain America's sidekick, "Bucky". On one mission, Baron Zemo had a bomb on a plane set to detonate with hostages onboard, namely, Bucky. Captain America failed to disable the bomb in time and Captain America was launched from the plane and Bucky supposedly died.
The Winter Soldier
However, sixty-nine years later, a mysterious Russian assassin appeared, codenamed, "The Winter Soldier". Captain America, beliving it was Bucky, set out to uncover the truth. After repeated encounters, Captain America finally managed to make Bucky remember who he is, with the help of the cosmic cube.