Black Widow and Scarlet Witch may be full-fledged Avengers, but they aren't the only heroines of the MCU. Peggy Carter was brought to the franchise back in Captain America: The First Avenger, and fans are thinking Hayley Atwell may be bringing Peggy back for another superhero outing. Over on Instagram, Atwell shared a photo of her onset for a film. The actress can be seen drinking from a mug with her hair pinned back to curl. The photo would be an innocent enough candid shot.