Under the orders of Nick Fury, Carter is assigned as an undercover nurse to watch over Steve Rogers, eventually assisting him with taking down S.H.I.E.L.D.

In February 2013, Canadian actress Emily VanCamp entered negotiations to join the cast of Captain America: The Winter Soldier as the female lead.

[2] Some critics voiced opinions about "how thin and slight she seems in photos and on Revenge" but the brothers defended her saying that, "She's obviously very credible with physicality, she holds the screen really well, and she even looks like the character from the comics".

[3][4][5] Her full name or family history was not revealed in the film due to the character being undercover as Agent 13, a nurse with the alias Kate, protecting Steve Rogers.

[6] On her character, VanCamp noted that in the film they're "introducing her" and "when we first see her, we realize she's living next to Captain America [...] they sort of have a little thing going on and as we all know in the comic books they had a love affair off and on for years.

[15][16] Despite this, VanCamp teased her expanded role, noting that her character "is definitely Team Captain America" and that she "got to do a small fight sequence with Scarlett Johansson".

[10] TheWrap writer Phil Owen noted that many heroes after the third and fourth Avengers films were pardoned for their crimes (such as Sebastian Stan's Bucky Barnes), yet Carter was not which he felt was "ridiculous on multiple levels" and that it "tarnishes Steve's legacy even further".

[9] In the series finale's mid-credits scene, Carter was revealed to have turned full villain, contacting buyers about selling secrets from her new government position.

[22] When VanCamp learned that Carter was the Power Broker, she felt it solidified the version of the character that appears in the series, and called the reveal "very fitting [since] she was hurt and scorned and went rogue".

[28] Contrastingly to the Marvel Cinematic Universe (MCU), Captain America travelled back in time to be with Carter's aunt, Peggy.

[30] Jackson was known for being dishonest with his clients by subjecting them to medical procedures they did not sign up for and giving them hardcore addictive substances to cause them to keep "coming back to him and paying for treatments".

[31][32] This story was adapted to the MCU showing Carter supplying a doctor named Wilfred Nagel with resources to recreate the Super Soldier Serum.

Sometime in 2014, Carter is assigned by the director of S.H.I.E.L.D., Nick Fury, to monitor and protect Steve Rogers / Captain America in his home apartment.

Rogers, Barnes, Sam Wilson, and T'Challa are eventually brought to the Joint Counter Terrorist Centre after being arrested and are greeted by Carter and Ross.

After a brainwashed Barnes breaks out of his cell with the help of his acting therapist, Helmut Zemo, Carter engages in a fight with him alongside Natasha Romanoff and Tony Stark.

Additionally, Carter takes in teenage Karli Morgenthau, who betrays her and steals twenty vials of the serum, using one on herself and much of the rest on members of her anti-nationalist terrorist group, the Flag Smashers.

After a fight breaks out between the four and other bounty hunters, Carter decides to stay behind in Madripoor but Wilson agrees to obtain a pardon for her so she can return to the United States.

She, alongside Hope van Dyne, Peter Parker, Bucky Barnes, Okoye, Bruce Banner, Kurt, and Happy Hogan, leave their base in New York City and travel to Camp Lehigh where a cure is said to be in development.

She meets with Riri Williams who is need of a magnetron, an essential part of a project she is working on to defeat Quentin Beck, the fascist leader of the Earth's remains.

[43] VanCamp's role as Sharon Carter has received praise with TheThings writer Anthony Spencer noting that she had "great presence in the MCU" before being seemingly disappearing from the franchise.

[37][45] Rolling Stone writer praised VanCamp's acting ability in The Falcon and the Winter Soldier, noting that she "does well with the bigger showcase and with playing a much more cynical Sharon than the one who flirted with Steve in the movies".

[47] Screen Rant writer Kai Young called Carter's transition to Power Broker one of Phase Four's most controversial stories.

[26] Similarly to D'Alessandro, he noted the transition made no sense as "Carter had always been depicted as a steadfast hero with a strong moral compass".

[26] Comic Book Resources writer Timothy Donohoo wrote that Carter's change into the "villainous Power Broker" was "poorly" written.