James Buchanan "Bucky" Barnes is a fictional character portrayed by Sebastian Stan in the Marvel Cinematic Universe (MCU) media franchise—based on the Marvel Comics character of the same name. 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 a
James Buchanan "Bucky" Barnes is a fictional character portrayed by Sebastian Stan in the Marvel Cinematic Universe (MCU) media franchise—based on the Marvel Comics character of the same name. 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 a
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James Buchanan "Bucky" Barnes is a fictional character portrayed by Sebastian Stan in the Marvel Cinematic Universe (MCU) media franchise—based on the Marvel Comics character of the same name. 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.
Barnes comes into conflict with Rogers and his allies during the Hydra uprising, eventually gaining some control over himself. However, Helmut Zemo later takes control of Barnes to destroy the Avengers. This conflict, along with internal strife over the Sokovia Accords, causes the Avengers to split up and Rogers is forced to hide Barnes in Wakanda, where Shuri eventually cures him of his programming and is given a new code name, White Wolf.
Barnes aids the Avengers in the conflict against Thanos, falling victim to the Blip. After he is restored to life, he joins the final and victorious battle against a variant of Thanos. After Rogers' retirement, Barnes is pardoned by the U.S. government and strives to make amends for his murderous past. He joins Sam Wilson in defeating the pro-Blip Flag Smashers and finds peace with Wilson. Later, Barnes is elected to the United States House of Representatives, and joins the New Avengers.
As of 2025, Barnes has appeared in nine MCU films, as well as in a lead role in the miniseries The Falcon and the Winter Soldier (2021). Stan's portrayal of the character has been met with positive reception. He is the only character who appeared in all four Captain America films.
Alternate versions of Barnes from within the MCU Multiverse appear in the animated series What If...? (2021–2024).
Concept and creation
Early life and World War II
James Buchanan Barnes was born on March 10, 1917. He and Steve Rogers became childhood best friends and on many occasions Barnes would protect Rogers from bullies. During World War II, Barnes is drafted in the U.S. Army, while Rogers is rejected from the service due to his numerous medical conditions. Barnes fights in Europe while Rogers is chosen for the Super Soldier Program by Dr. Abraham Erskine and becomes Captain America.
In 1943, while on tour in Italy performing for active servicemen, Rogers learns that Barnes' unit was MIA in a battle against the Nazi forces of Johann Schmidt. Refusing to believe that Barnes is dead, Rogers has Peggy Carter and engineer Howard Stark fly him behind enemy lines to mount a solo rescue attempt. Rogers infiltrates the fortress of Schmidt's Nazi science division, Hydra, freeing Barnes and the other prisoners, with Barnes having just been experimented on by Hydra. Barnes becomes part of an elite unit assembled by Rogers called the Howling Commandos, participating in numerous missions against Hydra and the Nazis. However, during one such mission, Barnes falls off of a train and is seemingly killed.
Hydra assassin
The scientific experimentation that Barnes endured allows him to survive his fall, but he is recaptured by Hydra and ends up being taken to their wing inside the Soviet Union. There he is tortured, br
When Joe Simon created his initial sketch of Captain America for Marvel Comics precursor Timely Comics in 1940, he included a young sidekick. "The boy companion was simply named Bucky, after my friend Bucky Pierson, a star on our high school basketball team," Simon said in his autobiography. Following the character's debut in Captain America Comics #1 (March 1941), Bucky Barnes appeared alongside the title star in virtually every story in that publication and other Timely series, and was additionally part of the all-kid team the Young Allies. Live-action performances of Steve Rogers in television and film serials began within a few years after its creation, with a 1990 feature film resulting in critical and financial failure, but none of these adaptations included Bucky as a character.
In 2005, Marvel launched a new Captain America series (Volume 5) with writer Ed Brubaker, who revealed that Bucky did not die in World War II. It was revealed that after the plane exploded, General Vasily Karpov and the crew of a Russian patrol submarine found Bucky's cold-preserved body, albeit with his left arm severed. Bucky was revived in Moscow, but had brain damage with amnesia as a result of the explosion. Scientists attached a bionic arm, periodically upgrading it as technology improved. Programmed to be a Soviet assassin for Department X – under the code name the Winter Soldier – he is sent on covert wetwork missions and becomes increasingly ruthless and efficient as he kills in the name of the state.
In the mid-2000s, Kevin Feige realized that Marvel still owned the rights to the core members of the Avengers, which included Captain America and his associated characters. Feige, a self-professed "fanboy", envisioned creating a shared universe just as creators Stan Lee and Jack Kirby had done with their comic books in the early 1960s. In 2005, Marvel received a $525 million investment from Merrill Lynch, allowing them to independently produce ten films, including Captain America. Paramount Pictures agreed to distribute the film. In April 2010, Sebastian Stan, who had been mentioned in media accounts as a possibility for the title role in Captain America, was cast as Bucky Barnes. Stan was contracted for multiple films.
The origin story of Bucky Barnes follows that of the comic books, particularly Ultimate Marvel for certain elements like growing up as Steve Rogers' childhood best friend in Brooklyn instead of a younger sidekick met later. However, his story diverges from there, with "the Winter Soldier play[ing] a major role that's completely different to the comics". In the comic books, Steve Rogers is murdered in the aftermath of the Civil War storyline, leading to Bucky Barnes becoming the next Captain America. In the MCU, Rogers survives Civil War, eventually passing the mantle of Captain America to Sam Wilson in Avengers: Endgame.
