While the entirety of the internet clamors over reports and rumors about who will ultimately be cast in Marvel Studios Fantastic Four, the studio’s worst kept casting secret actually belongs to another of its 2025 films. Last February, The Walking Dead and Beef star Steven Yeun joined the cast of Thunderbolts in a “mystery role” which was no mystery at all. By early March, reports revealed that Yeun had joined the MCU as the Sentry and while Yeun refused to talk to much about his role, he did share his excitement about landing a role in a Marvel Studios project.
I feel good. I feel excited. I feel like a new challenge. I feel blessed to be able to play in a place that reaches so many people. I got to touch that on Walking Dead. It feels exciting to get another chance to connect with people in another way.Steven Yeun on joining the MCU-Total Film
As expected, nobody at Marvel Studios has addressed the nature of Yeun’s role either, keeping it a “big surprise” for an official reveal at some sort of con or event. But while neither Yeun nor the powers that be at Marvel Studios want to address it, writer Robert Kirkman who created Marvel Zombies at Marvel Comics back in 2006 and both The Walking Dead and Invincible–two projects which have been adapted to TV and starred Yeun–has no problems discussing it. During a conversation with artist David Finch, Kirkman shared a fun anecdote about Yeun, attending a costume fitting for the Sentry.
“My good friend Steven Yeun in playing the Sentry in a movie,” said Kirkman. “Yeah, he called me…he went in for a costume fitting…I hope I’m not…I don’t think this is a spoiler or anything that’ll 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 gonna do to me?” Kirkman continued, “But 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 ‘Aw, crap! I forgot Invincible is yellow and blue.’“
Kirkman’s realization that he had potentially revealed something was quickly followed by the realization that he didn’t care at all. After more than a decade of Marvel sniper culture, it’s refreshing to see Kirkman address the studio’s chicanery in regard to these “super secret” castings.
After quite a few changes to the creative team and delays due to the WGA and SAG strikes, Thunderbolts is expected to go into production in 2024 and land in theaters on July 25, 2025.