Sharon Carter (Agent 13)

• Core Identity: Sharon Carter is a highly trained secret agent of S.H.I.E.L.D. and a key ally (and love interest) of Captain America, whose unwavering idealism is constantly tested by the grim realities of espionage and government betrayal.
• Key Takeaways:
• Role in the Universe: As Agent 13, Sharon Carter operates in the world of high-stakes espionage, often serving as a key operative for S.H.I.E.L.D. and a direct field commander. She represents the often-blurry line between patriotism and the morally compromising actions required to protect a nation, serving as a pragmatic counterpoint to Steve Rogers (Captain America)'s steadfast principles.
• Primary Impact: Sharon's most defining moment in the comics was her tragic role in the assassination of Captain America following the superhero Civil War, an act she was brainwashed into committing by Doctor Faustus. In the MCU, her impact is defined by a dramatic heel-turn, becoming the ruthless crime lord known as the Power Broker after being abandoned by her country.
• Key Incarnations: In the Earth-616 comics, she is a loyal, though hardened, hero who has served as Director of S.H.I.E.L.D. and remains a steadfast patriot. The Marvel Cinematic Universe depicts a darker trajectory, where government betrayal following the events of Captain America: Civil War pushes her to abandon her ideals and build a criminal empire in Madripoor.

Sharon Carter made her first appearance in Tales of Suspense #75 in March 1966, a product of the legendary creative team of writer Stan Lee, penciler Jack Kirby, and inker Dick Ayers. Her creation came during the height of the Cold War, a period where spy fiction, exemplified by James Bond, was immensely popular. Marvel Comics capitalized on this trend by expanding the world of espionage within their superhero universe, with S.H.I.E.L.D. becoming a central fixture. Initially, Sharon was introduced as the younger sister of Peggy Carter, Captain America's lost love from World War II. This created an immediate and poignant romantic tension, as Steve Rogers was drawn to a woman who so strongly resembled the one he lost. This familial connection, however, would later be the subject of a significant retcon. As comic book timelines advanced while characters remained relatively ageless, it became chronologically implausible for Peggy to have a younger sister of Sharon's age. The continuity was eventually updated to establish Sharon as Peggy's niece instead, a relationship that has remained canonical and was adopted by the Marvel Cinematic Universe. Her codename, Agent 13, established her from the outset as a capable and mysterious figure in her own right, separate from her connection to the Carter legacy.

A character's history is often shaped by their universe. For Sharon Carter, the differences between her comic book origins and her cinematic adaptation are stark, reflecting a fundamental divergence in her character arc.

Born into a wealthy Virginia family, Sharon Carter grew up idolizing her aunt, Margaret “Peggy” Carter, a celebrated freedom fighter who worked with the French Resistance during World War II. Inspired by her aunt's stories of heroism and adventure alongside Captain America, Sharon joined the international espionage agency S.H.I.E.L.D. as soon as she was old enough. She quickly proved to be a natural, excelling in her training to become a top-tier field agent. She was given the codename “Agent 13.” Her path first crossed with Steve Rogers when she was assigned to retrieve a powerful explosive, Inferno-42, from the villainous organization known as THEM. During the mission, she fought alongside Captain America, who was struck by her courage and her uncanny resemblance to Peggy. Though she initially kept her identity a secret, their professional partnership soon blossomed into a deep and passionate romance. Sharon became one of Steve's most trusted allies and confidantes, fighting threats ranging from HYDRA to the Red Skull. Her career was marked by incredible bravery and tragedy. In one notable incident, she was believed to have been killed while under the mind control of Doctor Faustus, seemingly immolating herself as part of a white supremacist rally. For years, Captain America and S.H.I.E.L.D. mourned her. However, it was later revealed that her death was staged by S.H.I.E.L.D. Director Nick Fury. In reality, Sharon had been left behind on a mission in enemy territory, disavowed by her own agency. Forced to survive on her own, she spent years working as a freelance mercenary and spy, becoming harder and more cynical. Her eventual return was a shock to Steve Rogers, and while they rekindled their relationship, she was a changed woman—more pragmatic and world-weary, but no less dedicated to her mission. This period cemented her reputation as one of S.H.I.E.L.D.'s most resilient and capable operatives, eventually leading her to serve as its Executive Director for a time.

In the MCU, Sharon Carter is established from the beginning as Peggy Carter's great-niece, aligning with the modern comic book continuity. She is first introduced in Captain America: The Winter Soldier as an undercover S.H.I.E.L.D. agent with the codename Agent 13. Posing as a friendly nurse named Kate, she is assigned by Nick Fury to live next door to Steve Rogers in Washington, D.C., to monitor and protect him. Her true identity and allegiance are revealed during the HYDRA Uprising, where she refuses to follow the orders of the compromised Agent Rumlow (Crossbones) and instead aids Captain America, Sam Wilson, and Maria Hill in exposing the conspiracy and defeating the HYDRA-controlled Helicarriers. Her loyalty to the true ideals of S.H.I.E.L.D. and Captain America costs her her career within the agency, and she transfers to the CIA. Her path crosses with Steve's again in Captain America: Civil War. Following Peggy Carter's death, she delivers a moving eulogy that inspires Steve's opposition to the Sokovia Accords. She uses her position within the Joint Counter Terrorist Centre to aid him, illegally returning his shield and Falcon's wings. This act of defiance forces her to go on the run from the U.S. government, branded a traitor. It is here that she and Steve share a kiss, hinting at a future that would never come to pass due to Steve's eventual timeline-altering decision at the end of Avengers: Endgame. The series The Falcon and the Winter Soldier reveals what happened to her next. Abandoned and hunted by her own country, Sharon fled to the lawless island of Madripoor. Embittered and disillusioned by her sacrifice being ignored, she utilized her skills to not only survive but thrive in the criminal underworld. She became the Power Broker, a shadowy figure who controlled the island's black market, dealing in art, technology, and even the Super Soldier Serum. Her transformation is a dramatic departure from her comic counterpart, showcasing a version of the character who has completely lost faith in the systems she once swore to protect, adopting a ruthless, self-serving philosophy in their place.

While sharing a common skillset, the two primary versions of Sharon Carter possess distinct personalities and access to different resources, reflecting their divergent life paths.

• Peak Human Physical Condition: Through S.H.I.E.L.D.'s intensive training regimen, Sharon maintains a physical condition at the peak of human potential. She possesses exceptional strength, speed, agility, and stamina, allowing her to contend with low-level superhumans and highly trained assassins.
• Master Martial Artist and Acrobat: She is an expert in numerous forms of armed and unarmed combat, including styles like Krav Maga, Boxing, and various martial arts. She is a fluid and formidable hand-to-hand fighter, capable of defeating multiple opponents simultaneously.
• Expert Marksman: Sharon is a crack shot with virtually any firearm, from standard-issue sidearms to high-powered sniper rifles.
• Master Spy and Tactician: Her greatest asset is her mind. She is a master of espionage, infiltration, disguise, and intelligence gathering. As a former Director of S.H.I.E.L.D., she is also a brilliant strategist and field commander, capable of coordinating complex missions and leading teams effectively.
• Equipment: As a S.H.I.E.L.D. agent, she has access to a wide array of advanced technology. Her typical loadout includes a sidearm (often a modified Glock or S.H.I.E.L.D.-issue energy pistol), communication devices, and various mission-specific gadgets. Her uniform is made of a Kevlar-like material offering protection from small arms fire.
• Personality: The comic version of Sharon is defined by a core of pragmatic idealism. While the grim nature of her work has made her tough and at times cynical, she has never lost her fundamental belief in fighting for the greater good. She is fiercely loyal, deeply courageous, and willing to make difficult, morally grey choices that Steve Rogers often cannot. Her dedication is her defining feature.

• Advanced Clandestine Skills: The MCU's Sharon demonstrates the same elite-level training as her comic counterpart. She is an expert in undercover operations, as shown by her “Kate” persona, and a highly capable combatant, holding her own against brainwashed supersoldiers like Bucky Barnes and numerous assailants in Madripoor.
• Master Tactician and Criminal Mastermind: As the Power Broker, she has elevated her strategic skills to a new level. She successfully built a criminal empire from scratch in a city full of the world's most dangerous people. This required not only tactical prowess but also an immense capacity for manipulation, intimidation, and long-term planning.
• Access to Black Market Technology: As the Power Broker, her arsenal is no longer limited to government-issue equipment. She has access to cutting-edge, often illegal, technology from around the globe. This includes sophisticated surveillance systems, advanced weaponry, and access to scientific resources like those of Dr. Wilfred Nagel, the scientist who recreated the Super Soldier Serum.
• Equipment: In her Power Broker persona, she utilizes silenced pistols and other untraceable weaponry. A key piece of her equipment shown in The Falcon and the Winter Soldier was a device that released a mercury vapor-based phototoxin, allowing her to assassinate targets remotely and discreetly.
• Personality: The MCU Sharon Carter underwent a radical personality shift. The idealistic agent from The Winter Soldier is gone, replaced by a bitter, cynical, and ruthless crime lord. Her primary motivation is self-preservation and the acquisition of power. She feels profoundly betrayed by her country and by heroes like Steve Rogers, who she feels abandoned her. While she aids Sam and Bucky, it is always with her own agenda in mind. This version is a dark reflection of what can happen when a hero's idealism is shattered by the system they served.

• Steve Rogers (Captain America): The defining relationship of her life in both universes, though with drastically different outcomes. In the comics, their romance is one of Marvel's most enduring, built on deep mutual respect, shared ideals, and battlefield trust. They have faced death, brainwashing, and long separations, but their bond has always been central to both their characters. In the MCU, their relationship was a budding romance tragically cut short. Her sense of betrayal is amplified by the fact that the man she risked everything for chose a different life in a different time, leaving her to fend for herself.
• Nick Fury: In the comics, Fury was her long-time mentor and commanding officer. Their relationship is one of deep professional respect, though often strained by the secrets inherent in their line of work. Fury trusts Carter's skills and judgment implicitly, often giving her command of critical operations. In the MCU, it was Fury who assigned her to protect Steve, indicating a similar level of trust in her abilities.
• Sam Wilson (Captain America): In the comics, Sharon and Sam have a strong professional friendship as two of Steve's closest and most loyal allies. In the MCU, their relationship is more complex. While she provides crucial help to him and Bucky in Madripoor, it's a transactional alliance. She aids them to further her own goals, culminating in her receiving a government pardon that she immediately plans to exploit, making her a potential future antagonist for the new Captain America.

• Doctor Faustus: In the comics, no villain has inflicted more personal damage on Sharon than Dr. Faustus. A master of hypnosis and psychological manipulation, he brainwashed her into firing the shots that seemingly killed Steve Rogers after Civil War. The trauma of this event, and the subsequent fight to clear her name and regain her own mind, made Faustus her most hated and personal foe.
• Red Skull (Johann Shmidt): As a high-ranking S.H.I.E.L.D. agent and Captain America's partner, Sharon has frequently battled the Red Skull and his various HYDRA splinter groups. The Skull represents the ultimate ideological opposite of everything she and Steve fight for, making their conflict a perpetual one.
• The U.S. Government (MCU): In a unique twist, Sharon's primary antagonist in the MCU is not a supervillain but the very institution she swore to protect. After being declared an enemy of the state for helping Captain America, she was hunted and disavowed. This betrayal is the catalyst for her entire transformation into the Power Broker, making the government's indifference and hypocrisy the true source of her villainy.

• S.H.I.E.L.D.: Her primary and longest-running affiliation in the comics. She rose through the ranks from field agent to, at one point, Executive Director, second only to Nick Fury himself.
• Secret Avengers: Following the Siege of Asgard, Steve Rogers formed a covert team of Avengers to handle missions that required more subtlety. Sharon was a key member, often acting as the team's mission coordinator and field support.
• Daughters of Liberty: A more recent affiliation in the comics. Sharon became the leader of this modern incarnation of a secret society founded during the American Revolution, dedicated to protecting the country from threats both foreign and domestic, operating completely outside of government oversight.
• Power Broker's Network (MCU): In the MCU, her affiliation is her own criminal empire. As the Power Broker, she commands a vast network of spies, smugglers, and assassins, making her a significant player in the global underworld.

In the aftermath of the superhero Civil War, a defeated but defiant Steve Rogers surrenders to authorities to prevent further conflict. As he is led up the steps of a federal courthouse, he is shot by a sniper, Crossbones, and then seemingly killed by several more shots fired at close range. The world is horrified to discover the assassin is a brainwashed Sharon Carter. Manipulated by a cabal including Doctor Faustus and the Red Skull, she was turned into a sleeper agent, a living weapon against the man she loved. The storyline that follows, Captain America #25-42, is a deep dive into her guilt and trauma as she slowly breaks free of her conditioning with the help of the Winter Soldier and Nick Fury. She becomes obsessed with finding redemption and uncovering the full scope of the conspiracy, which ultimately leads to the discovery that Steve was not killed, but trapped, displaced in time. Her journey through this arc is one of her most defining, showcasing her immense resilience in the face of unimaginable horror.

This film marks Sharon's introduction to the MCU and establishes her core principles. As the undercover Agent 13, she proves her loyalty is to ideals, not institutions. When HYDRA's infiltration of S.H.I.E.L.D. is revealed, she immediately stands with Captain America against her compromised superiors at the Triskelion. Her line, “I'm not a nurse,” followed by her unflinching stand against HYDRA agents, instantly defined her as a competent and heroic character. This film establishes the foundation of her character that would be so dramatically subverted years later.

This series is the most pivotal event for the MCU's version of Sharon Carter. Reintroduced after being absent since Civil War, she is revealed to be a fugitive living in Madripoor. She acts as a reluctant guide for Sam and Bucky, using her criminal connections to help them track the source of the new Super Soldier Serum. The series slowly unravels the mystery of her new life, culminating in the shocking reveal that she is the Power Broker. The finale sees her secure a full pardon and a position back in U.S. intelligence, a scene immediately followed by her making a call to sell government secrets and weapons on the black market. This storyline cemented her transformation from hero to a morally ambiguous, if not outright villainous, figure, posing a significant future threat.

This storyline, masterminded by writer Mark Waid and artist Ron Garney, was responsible for bringing Sharon Carter back into the modern Marvel Universe after she had been presumed dead for years. It was revealed that her “death” was a ruse and she had been working deep undercover. Her return in Captain America (Vol. 3) #1 re-established her relationship with Steve Rogers but also introduced the more hardened, world-weary persona that has defined her ever since. This arc was crucial in modernizing her character and moving her away from simply being “Captain America's girlfriend” to a more complex and independent operative.

• Ultimate Universe (Earth-1610): In the Ultimate Marvel Universe, Sharon Carter is also a S.H.I.E.L.D. agent, but she plays a much less prominent role. She is depicted as a tough, reliable agent and is part of the team that works with the Ultimates, but she lacks the deep personal connection to Captain America that defines her mainline counterpart.
• Marvel Mangaverse (Earth-2301): This version presents a significant departure. Here, Sharon Carter is the iron-fisted Director of S.H.I.E.L.D. and the President's security advisor. She is portrayed as far more ruthless and antagonistic, clashing with that universe's Captain America over his methods and ideals.
• Age of Ultron (Comic, 2013): In the dystopian timeline created by Ultron's victory, a grizzled, battle-hardened Sharon Carter is shown as a member of Nick Fury's resistance fighters, operating out of a secret bunker in the Savage Land. This version showcases her survival skills in an apocalyptic setting.
• Captain America: Super Soldier (Video Game): In the video game tie-in to Captain America: The First Avenger, which exists in its own continuity, Sharon Carter appears in the present day as a S.H.I.E.L.D. agent communicating with a recently thawed-out Steve Rogers, guiding him on a mission against Arnim Zola and HYDRA.

• Steve Rogers (Captain America)
• S.H.I.E.L.D.
• Peggy Carter
• Power Broker
• Civil War (Comic Event)
• The Falcon and the Winter Soldier
• Doctor Faustus
• Nick Fury

^{1) 2) 3) 4) 5) 6)}