Recently, Thunderbolts*director Jake Schreier opened up about how Sebastian Stan's Bucky Barnes enters the film's story. Notably, the character has been part of the Marvel Cinematic universe since way back in 2011's Captain America: The First Avenger. Bucky originally appeared as the best friend of Steve Rogers/Captain America, before he was brainwashed by Hydra into becoming the Winter Soldier. Throughout his time in the franchise, he has been a hero, a villain, and an antihero, undergoing an emotional journey to regain his sense of self.