Fan Casting Captain America: Imposter (My MCU)

John Walker is a jealous man with a strong hatred for Captain America. Walker believes that Captain America only does things for his own gain and for people to like him, so he himself takes up the mantle as Captain America and does what he thinks the people want. John Walker (who now goes by the name U.S. Agent) goes after innocent politicians that New Yorkers seem to dislike. However, everything goes wrong when John happens to kill a high-ranking member of parliament, causing John Walker to go crazy, going on a killing spree. This catches the attention of Steve Rogers, who with the help of the Falcon and the White Wolf (Bucky Barnes new persona) takes on the U.S. Agent.