Related: Loki: Where Else You've Seen The Main Cast
Agent Peggy Carter has been a mainstay of the MCU ever since her debut in Captain America: The First Avenger. She's appeared in a huge array of films and even boasted a titular TV series of her own. Fans believe they have spotted Carter being arrested by the Tva though. There are perhaps some clues as to why that may be the case and whether that really is Peggy in the background of the Loki scene.
Warning: This article contains major spoilers for Loki episode 2.