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D23 Expo 2019: Wyatt Russell's John Walker aka U.S. Agent may probably essay a pseudo Captain America in the series

That's bad news for Anthony Mackie's Sam Wilson aka Falcon as he is supposed to take over the mantle, but still faces stiff resistance from the Government after the events of 'Civil War'

Marvel's 'The Falcon and The Winter Soldier' saw a new cast addition announced during the D23 Expo 2019. Wyatt Russell joins the show along with Emily Van Camp, who reprises her role as Agent Sharon Carter from 'Captain America: The Winter Soldier' and 'Captain America: Civil War'. 

Russell will be seen playing John Walker, otherwise known as the U.S. Agent. Walker was turned into a version of Captain America to work solely on behalf of the United States Government. According to the comics, he makes his debut as Super-Patriot, a supervillain. At this stage, it's yet to be confirmed if Russell will be Sam Wilson aka Falcon's (Anthony Mackie) friend or foe. As with most things at this stage in development, Marvel remains mum on the storyline.

Walker was seen as a man determined to take over the Cap America mantle. In the comic, 'Captain America #354' he uses a discarded costume of Steve Rogers (the original Captain America), a black outfit with a different alignment of the stars and stripes to differentiate it from Rogers' suit.

It is safe to assume that Walker may take the shield from Falcon given the fact the Government hasn't really forgiven him and Bucky Barnes aka The Winter Soldier for the events during 'Civil War'. Should Walker go on to become the new Cap, Wilson and Bucky will have a fight on their hands. 

Walker's introduction also adds to the other plotline of the world trying to get used to not having the Avengers around. Post 'Avengers: Endgame', most of the superheroes have gone their separate ways. Tony Stark aka Iron Man and Natasha Romanoff aka Black Widow are dead, Hawkeye and Hulk have seemingly retired and the Guardians are off galaxy-trotting. This means the earth is vulnerable to threats and the powers that be decide to replace the superheroes with new ones. 

Russell's casting was one of several big Marvel announcements made on the opening day of the expo, In addition, Marvel has greenlit three new shows for the service, 'Ms. Marvel,' 'Moon Knight' and 'She-Hulk.'

'The Falcon and The Winter Soldier' will debut on August 2020.