<Li> Bucky Barnes appears in The Avengers: Earth's Mightiest Heroes, voiced by Scott Menville (Bucky) and by Jon Curry (Winter Soldier's animated debut). In the show, Bucky assisted Captain America during World War II . He and Captain America snuck in to a HYDRA base, where they battled creatures from other realms . When Bucky and Captain America later go after the Red Skull onto the villain's rocket ship, Bucky's leg got caught in a bar . When Captain America tried to help him, Bucky kicked his friend off, stating that "The World needs Cap more than it needs Bucky Barnes". Although presumed dead for decades, he returns (possibly due to Captain America's contact with the Cosmic Cube) as the mysterious Winter Soldier, one of Dell Rusk's government operatives along Doc Samson, Falcon and the Red Hulk . </Li> <Li> Bucky Barnes appears in The Super Hero Squad Show, voiced by Rod Keller . He appears in the episode "World War Witch". </Li> <Li> The character appears in the Avengers Assemble animated series, with the Winter Soldier voiced by Bob Bergen (in "Ghost from the Past"), and by Roger Craig Smith (in "Spectrums"), and Bucky Barnes voiced by Robbie Daymond . In the episode "Ghost from the Past", Winter Soldier infiltrates Avengers Tower in order to abduct the Red Skull and take his own revenge which conflicts with the Avengers needing information on Thanos . During a fight on a rocket, Winter Soldier fights Captain America before retreating . In the episode "Spectrums", a spectral version of Winter Soldier is made from Captain America's fears thanks to Doctor Spectrum, however, Captain America eventually overcomes the nightmare . In the episode "Saving Captain Rogers", Captain America gets trapped in a hypnosis where Bucky helps fight Heinrich Zemo's HYDRA army . It was Bucky that enabled Captain America to snap out of the hypnosis to assist Iron Man and Black Widow against Helmut Zemo . </Li> <Ul> <Li> The Ultimate version of Bucky Barnes appears in the animated direct - to - video film Ultimate Avengers, voiced by James Arnold Taylor . </Li> <Li> Sebastian Stan portrays Bucky Barnes in the Marvel Cinematic Universe in a nine - picture deal with Marvel Studios to play the character . <Ul> <Li> In Captain America: The First Avenger, Bucky is a year older than Rogers, rather than a teenager and is his childhood best friend . He often protects Rogers from neighborhood bullies and tries to discourage him from joining the war effort due to his poor health . He serves in World War II along with Rogers, now Captain America, until he falls to his apparent death . This version is thus a combination of the mainstream and Ultimate version of the character . </Li> <Li> In Captain America: The Winter Soldier, A brainwashed Bucky is commanded by Hydra as the Winter Soldier, Hydra's biggest weapon . He ambushes and attempts to assassinate Nick Fury, and later attacks Rogers, Natasha Romanoff and Sam Wilson . During the fight, Rogers discovers the Winter Soldier's identity . In the climax, Bucky intercepts Rogers and Wilson when they attempt to disarm Hydra's Helicarriers, but Bucky begins to remember his friendship with Rogers; after the Helicarriers crash, Bucky rescues Rogers from the Potomac River . In a post-credits scene, Bucky visits the Captain America exhibit at the Smithsonian Institution, determined to remember and regain the memory of his old life . </Li> <Li> In the post-credits scene of Ant - Man, Bucky is shown to have his metal arm caught in a vise, and speaks to Rogers and Wilson . This scene also appears in Captain America: Civil War . </Li> <Li> In Captain America: Civil War, Rogers tries to protect Bucky from the authorities as he is framed by Helmut Zemo for a terrorist bombing . It is revealed at one point that though Bucky is in the process of regaining his memory, his Winter Soldier mindset is still inside him, which can be activated with a code word, causing him to revert into the Winter Soldier mindset . Throughout the film, Bucky slowly regains his memories and resumes his friendship with Steve, as well as getting to know several allies of Steve and fighting alongside them in several moments . Zemo eventually reveals that Bucky had assassinated Tony Stark's parents while brainwashed by Hydra, a fact which Rogers had kept from Stark . Blinded by vengeance, Stark fights Bucky and Rogers, destroying the former's metal arm . Bucky is granted sanctuary in Wakanda, where he chooses to return to suspended animation until a way is found to undo Hydra's brainwashing . </Li> <Li> Bucky appears during the post-credits scene of the film Black Panther, where he is resting in a village after Shuri helped to remove the Hydra trigger words from his mind . He is given the nickname "White Wolf" by a group of children . </Li> <Li> Bucky appears in Avengers: Infinity War . He is given a new metal arm by T'Challa and rejoins with Captain America and the Avengers once again in the Battle of Wakanda to protect Vision from Thanos' forces . When Thanos wipes out half of the universe with the Infinity Gauntlet, Bucky is the first hero to be disintegrated . </Li> </Ul> </Li> </Ul>

How does bucky barnes become the winter soldier