“Loki” introduces audiences to the concept of variants, people guilty of creating a new unauthorized branch from the Sacred Timeline, and whose very existence jeopardizes the fate of the universe. Our Loki is one of these variants, which is why he was apprehended by the TVA in the first place. Later in Episode 1, the God of Mischief wanders the corridors of the agency looking for a way to escape, while in the background one of the Hunters can be seen escorting a variant through one of the time doors. Fans on Twitter think the fugitive is none other than Peggy Carter (Hayley Atwell).
At first glance, it’s easy to see why. The unknown woman looks to have a similar 1940s hairstyle, and she’s of a similar height and build to Agent Carter. Plus, we already know that Steve Rogers (Chris Evans) wound up going back in time to be with her at the end of “Avengers: Endgame.” Sure sounds like the kind of thing the TVA might be concerned with — especially if Rogers created an unauthorized branch in his efforts to return to his lost love.
As mentioned in the “Loki” Episode 1, the Avengers’ time-traveling actions were sanctioned by the Time Keepers, so Steve’s presence in the past should’ve been fine. However, Peggy would’ve been classified as a variant, because we know her life would’ve been different without the Star-Spangled Man. Interestingly, the woman in the “Loki” scene wasn’t restrained by the Hunter who was walking with her, as her arms are free when she walks through the time door. Loki, on the other hand, was instantly handcuffed.