Straight from the Marvel Universe, Agent Carter tells the story of Peggy Carter, a character who is first seen in Captain America: The First Avenger. Aside from being Captain America's one true love — the same one he goes back in time to be with in Avengers: Endgame — Peggy Carter is an undercover Strategic Scientific Reserve agent, and the show follows her adventures as she uncovers sinister plots and catches evil villains, all while navigating life as a woman in the 1940s.