Technically, she's not called Captain Britain. When agent Peggy Carter becomes a Union Jack-clad, Captain America-style shield-wielding superhero right at the start of episode 1 of What if ...

Marvel’s second TV series on ABC tracks the exploits of Agent Peggy Carter, played by Hayley Atwell, last seen in Captain America: The Winter Soldier. Marvel One-Shots: A 5-minute oral history ...

Marvel Studios was briefly considering having the lovebirds reunite in a movie of their very own, but couldn't settle on a story.

Atwell first portrayed the MI6 agent, Peggy Carter ... Following the conflict, Carter went on to help establish SHIELD, ultimately rising to the position of its director. In 2022, Atwell returned ...