The relationship between Steve Rogers and Bucky Barnes featured heavily in every Captain America movie. Friends since childhood and squadmates in World War II, Rogers assumed Bucky died during the events of The First Avenger. Things got complicated in the modern day though, where Rogers discovered his friend had been brainwashed into becoming the Winter Soldier. Their story came to a head in last year's Avengers: Endgame, where an aged Steve had a choice of who to bequeath the Captain America title and shield to.