‘Invincible’ Creator Robert Kirkman Just Revealed Steven Yeun’s MCU Character

It has been rumored for months that Steven Yeun is joining the Marvel Cinematic Universe as one of the ongoing saga's new slate of superheroes, and his casting in 2025's Thunderbolts movie is now confirmed.

Of course, Yeun already has one superhero credit to his name, as he plays the protagonist Mark Grayson in Amazon's ultra-violent animated series Invincible, based on the graphic novel by Robert Kirkman. And it was actually Kirkman who let slip the secret identity of Yeun's Marvel character.

During a live-streamed conversation with comic artist David Finch, Kirkman revealed that Yeun will be playing Robert Reynolds, aka the Sentry, in the MCU.

"My good friend Steven Yeun is playing the Sentry in a movie," he said. "I don’t think this is a spoiler or anything that will get anybody in trouble. I don't know, maybe. We'll see. I don't care. I don't work for Marvel. What are they going to do to me?"

"Yeah, he called me and he said, 'I just came back from a costume fitting for the Sentry. I guess I only do superheroes that are yellow and blue.' He said he was at the costume fitting and was like, 'Aww, crap. I forgot Invincible was yellow and blue.'"

In the Marvel Comics, Sentry is a character with the "power of a thousand suns" who has teamed up with the Avengers, SHIELD, and the Fantastic Four. However, he also has a dark side, and frequently does battle with his villainous alter ego the Void. It is likely that this will play into his appearance in Thunderbolts, which focuses on multiple villains and antiheroes from previous MCU phases.

Yeun's breakout role came in the long-running post-apocalyptic series The Walking Dead, also based on one of Kirkman's comic books, in which he played fan-favorite character Glenn. Since leaving the show, he has gone on to receive critical acclaim for his performances in the movies Minari and Burning and the Netflix comedy Beef, as well as a scene-stealing appearing in Jordan Peele's Nope.

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