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The war's out there, Colonel, not in here. If we're going to win, it won't be with me stuck behind a desk.
~ Peggy Carter to John Flynn.
Dr. Margaret "Peggy" Carter, Ph.D., also known as Captain Carter, is the tritagonist of the first season of the What If series, as the titular protagonist of the first episode "What If Captain Carter Were the First Avenger" and the protagonist of the finale "What If The Watcher Broke His Oath".
She is an variant of Peggy Carter who took the Super Soldier serum instead of Steve Rogers, becoming a superhero to fight HYDRA. She would sent to the twenty-first century, where she became an agent of S.H.I.E.L.D. and later the Guardians of the Multiverse to stop Infinity Ultron.
While the majority of the events leading up to the serum test stay the same, the changes begin when, at the serum test, Peggy opts to watch from the main theatre instead of the observation room. Heinz Kruger detonates his bomb next to Abraham Erskine, instantly killing him and interrupting the test, and shoots Steve Rogers as he is exiting the pod. However, Peggy shoots Kruger dead, and enters the pod herself, being injected with the serum and gaining superhuman strength and resilience. Despite the objections of Colonel Flynn, Peggy retrieves the recently-stolen Tesseract from HYDRA, with Howard Stark using it to build Steve's "HYDRA Stomper" suit, while Peggy takes up the alias of "Captain Carter".
Carter, Rogers and the Howling Commandos continue to battle both Nazi and HYDRA soldiers over the span of the war, and form a romantic bond over time. However, HYDRA's leader Red Skull, who seeks to use the Tesseract to summon a extraterrestrial beast to win the war, tricks Carter and the team into raiding a train full of dynamite, with the resulting explosion seemingly killing Rogers. Distraught and vengeful, Carter decides to launch a direct attack on HYDRA's base. There, they find both Rogers being held prisoner, and Red Skull using the Tesseract to successfully summons the beast. However, it instead kills Red Skull and starts to destroy the base. Despite the team's best efforts, they are unable to close the portal, and Carter is forced to push the beast back in, being pulled into the portal herself and disappearing from Earth for 70 years.
Carter is transported to the year 2012, having likely defeated the beast. She is met by Nick Fury and Clint Barton. Carter is saddened to learn that she has returned long after World War II's end, believing Rogers to be long dead by now. She would become an agent of S.H.I.E.L.D., and would battle against Batroc. During her battle against him, she saw Uatu the Watcher in the sky, who informed the agent that she had been chosen to join the Guardians of the Multiverse. Joining with T'Challa, Doctor Strange, Gamora, Prince Killmonger, and Party Thor, Carter battled Infinity Ultron in stopping the rogue A.I. from destroying the entire multiverse.
While her physical appearance is mainly the same as her original counterpart, she becomes much taller and more muscular after being injected with the Super Soldier serum. As Captain Carter, she wears a armored bodysuit with the pattern of the Union Jack, with her vibranium shield showing a similar pattern.
Much like her main timeline counterpart, Captain Carter is brave and not happy with gender discrimination. Proof of her good heart is that Erskine's serum gave her the same result as Steve in the main timeline. Just like her main counterpart, Peggy still loved Steve; respecting his choice to join the war in Howard's HYDRA Stomper armor. Even when she arrived in the 21st century, Peggy held a torch for him.
To be added
Powers and Abilities
Artificially Enhanced Physiology: To be added
Superhuman Intelligence: To be added
Superhuman Strength: To be added
Superhuman Durability: To be added
Superhuman Speed: To be added
Superhuman Agility: To be added
Superhuman Stamina: To be added
Superhuman Reflexes: To be added
Superhuman Senses: To be added
Regenerative Healing Factor: To be added
Superhuman Longevity: To be added
Master Martial Artist: To be added
Shield Mastery: To be added
Sword Mastery: To be added
Expert Marksman: To be added
Master Acrobat: To be added
Master Tactician: To be added
Captain Carter's Shield: To be added
Pistol: To be added
Captain Carter's Sword: To be added
Although most What If...? episodes are meant to be standalone and their characters only having one-shot appearances, it's confirmed that Captain Carter will be appearing in future episodes of the show and her universe will be revisited due to her popularity.
What If...? director Bryan Andrews has also expressed interest in a live-action film franchise starring Captain Carter with Hayley Atwell reprising her role as a potential live-action spin-off of What If...?, as executive producer Brad Winderbaum has stated that there's potential for some characters in the show to appear in live-action media if they prove popular.