Captain Carter shield

Captain Margaret Elizabeth "Peggy" Carter is a Strategic Scientific Reserve agent during World War II. When Steve Rogers, the original candidate for Project Rebirth, was wounded by Heinz Kruger, Carter volunteered herself as a replacement, despite John Flynn ordering received the Super Soldier Serum, and became the first successful super soldier. Being given the rank of Captain and donning the colors of the Union Jack, she entered the war leading the Allied forces against HYDRA as Captain Carter. Her first mission was a successful one in which she retrieved the Tesseract, which was found and taken by Red Skull. In a later mission to infiltrate a HYDRA train, Rogers was lost to an explosion and an avalanche. Carter's final battle against HYDRA would result in a reunion with Steve and her sacrificing herself to stop the Champion of HYDRA, going through a wormhole from which she emerged almost seventy years later.

Now a woman out of time, Carter joined S.H.I.E.L.D., but mourned the loss of Rogers, who she believed to be dead. When on a mission with Natasha Romanoff to retake the Lemurian Star, Captain Carter was summoned by The Watcher alongside several others to defend the Multiverse from Ultron. Afterwards, Captain Carter was returned to her home reality, where Romanoff informed her that Rogers' HYDRA Stomper armor had been found with someone inside it.