As some fans were excited to see this character make is way into the Marvel Cinematic Universe, others were not familiar with his comic book origins.

In Marvel's widely praised series, The Falcon And The Winter Soldier, fans were introduced to a new character that has doubled as an ally and an enemy: The U.S Agent.

The show's Captain America replacement, John Walker, started off as just that: a replacement meant to fill the role of America's iconic 'Star-Spangled Man With A Plan'. As the show progresses, we see Walker's decent and desperation of trying to be the best Captain America he can be, portrayed by Marvel's newcomer Wyatt Russell.

Russell's depiction of the crazed Cap has sparked reactions as soon as he showed his true colors, proving that this is not the Captain America that we are used to.

Related: John Walker Aka Captain America Goes Rogue In ‘Falcon And The Winter Soldier’

At the show's end, Walker emerges with a new suit and a new name, paving the road for his future involvement in the MCU.

Casual viewers of the show may not have caught the significance of this new mantle, so lets take a look at his comic book roots to fully understand who The U.S Agent is, and maybe see where the MCU will lead him next.

His Comic Origins Are A Little Different

The MCU's John Walker and comic book John Walker are fairly similar to how they are brought up. Both versions join the military after college, unite with Lemar Hoskins, but the way they are introduced to the Super Soldier Serum is quite different.

Fans familiar with the show can recount that Walker gained his abilities from a batch that the Flag Smashers had, after being Captain America for some time. In the comics, he was offered the serum before he had even become a superhero, by the Power Broker himself.

Taking on the name Super-Patriot, Walker and his group of comrades (Hoskins included) go on tour delivering patriotic speeches, holding rallies, and fighting crimes that he deemed fit if they gained him enough clout.

He Has Fought Steve Rogers Himself

Contrary to the show, John Walker in the comics did not have that much respect for the original Captain America. Walker still aspired to be a patriotic crime-fighting hero like Steve Rogers but would talk down on the original Cap at his numerous rallies.

Walker had staged several attacks targeted at himself at these rallies, attempting to win over the public with how strong and powerful he was. Steve Rogers would eventually catch onto this and later confronted Walker.

After warning Walker of exposing him as a fraud, they get into a brawl. One thing to note here is that Walker is superior is strength, reflexes, and ability compared to Steve.

They battle against each other many times throughout the comics, but eventually join forces to take down their shared foes.

As cool as it would be to watch this fight go down in the MCU, fans are sure that this is not likely to happen, no matter what kind of rumors Wyatt Russell will try to spread.

Related: 'Falcon And The Winter Soldier': Wyatt Russell Trolls Fans, Suggests Chris Evans' Return

He Eventually Joins The Avengers

After his differences with Steve Rogers, Walker ends up turning a new leaf and joining the Avengers. As an Avenger, he forms an alliance with Clint Barton, AKA Hawkeye, who he becomes pretty good allies with. At one point he even worked with Tony Stark, War Machine, and even Scarlett Witch.

With Hawkeye's spinoff series just around the corner, we may just see an allyship form between the two heroes. After all, the MCU is known for utilizing cameos of superheroes from other movies and shows.

This is just a fragment of The U.S Agent's adventures, so checking out the comics is highly recommended to get a full appreciation for the character. The hardcore fans of Marvel on Twitter seem to be quite satisfied with the choices Marvel has made with their favorite heroes.

As Marvel content moves forward, fans are happy that their favorite characters are in good hands. Even the most underrated heroes.

Next: Marvel Fans Thrilled After ‘Falcon and the Winter Soldier’ Introduces The Future Falcon