Sharon Carter (known as Agent 13 and also secretly as the Power Broker) is the great-niece of Peggy Carter and an agent in S.H.I.E.L.D. who made her first appearance in Captain America: The Winter Soldier, and then returned in Captain America: Civil War. She also appears in the Disney+ series The Falcon and The Winter Soldier. Sharon is introduced in the Marvel Cinematic Universe as a heroine and ally of Captain America, but years later she turns to the world of crime, secretly becoming a villain and the ruler of the city of Madripoor.