'Black Mirror's Jimmi Simpson on his favorite episodes, the big 'USS Callister: Into Infinity' reveal, and more (2025)

For Jimmi Simpson, getting cast on Black Mirror back in Season 4 was a dream come true. The character actor who's won critics' praise on everything from the madcap sitcom It's Always Sunny In Philadelphia to the sci-fi Western WestWorld to David Fincher's masterful true crime thriller Zodiac was a big fan of Charlie Brooker's anthology series.

"When I first was invited to come for ['USS Callister'], it was my favorite show," Simpson said of Black Mirror in a Zoom interview with Mashable ahead of the Season 7 debut. "I couldn't believe it. And I had the exact same feeling [coming back for 'USS Callister: Into Infinity']."

Simpson was awed by the storytelling Brooker displayed within Black Mirror. "It's reminiscent to me of my early loves of Ray Bradbury, Isaac Asimov, and Rod Serling [The Twilight Zone]. When I saw those first two seasons, [Brooker] was predicting a very simple but truthful future that seems kind of inevitable. And they're always based in these human issues like fear, loneliness, need for connection."

These themes reverberate in Simpson's two favorite Black Mirror episodes, "Be Right Back" and "The Entire History of You," both of which involve in one way or another the loss of a romantic partner — one through death, the other through a brutal breakup. "It was shocking," he said of the impact of those Season 1 episodes. "It was like that shock of recognition that's so rare from current literature. I will say that was so raw, those episodes, so honest."

Walton has sharper relevance in "USS Callister: Into Infinity."

In both "USS Callister" and its sequel, Simpson plays tech billionaire James Walton, who exists in the real world and as a digital clone in Infinity, the online video game he produced with designer Robert Daly (Jesse Plemons).

He relished getting back together with the cast, which includes Plemons, Cristin Milioti, and Billy Magnussen, and enjoyed reflecting on "how pertinent" their first adventure as the crew of the USS Callister was. "And now even more so," Simpson explained, "Specifically with my character, Walton, an unobstructed tech billionaire, making ego-based choices that are destroying others — [that] is so current."

"It was going to be fun to show, like, what an asshole, ludicrous fool someone like that is, and how it is just pure thoughtlessness that motivates all their bad choices and pure greed that motivates all their positive choices —for themselves," Simpson said, "So it was time to get in there and articulate those two elements of this guy."

Simpson refrained from naming which tech billionaire he could be talking about. But we have a guess.

Jimmi Simpson on Walton's "therapy"

In his first Black Mirror episode, Simpson would describe Walton as "a dick, selfish and thoughtless." But in "USS Callister: Into Infinity," real-world Walton reaches new depths of financial-driven selfishness. Spoiler alert: He not only is the one who gave Bob Daly the DNA machine that allowed the deranged gamer to create digital clones of others, but also, Walton did it to Bob first. Eleven years before Daly's human death, Walton pushed him to place a digital clone of himself at the "heart of infinity" so the game could constantly be worked on by Daly's genius, without rest.

"To unpack [that], it's a thoughtless choice," Simpson said of Walton's plan to rush toward the game's release. "He is the genesis for all of the problems." The actor allows that Daly might have always been a brewing threat. "There's the argument of like, 'Well, Daly's crazy, and he was going to find a gun eventually.' I don't know if he would find a DNA cloner eventually, you know?"

Reflecting on Walton's choices, Simpson considered, "To find out that all of this [putting digital clones in the game] began because of a thoughtless moment where Walton said, 'Well, I think this will get the money in a little sooner.' And not to think once, what are you doing to this man? What does consciousness mean? [Walton is] a man who's never thought of that until episode one, and he's stripped of all of his power, and he's thrust into the Callister under Daly's control. And so that's where those characters break, and you allow the one, let's call it therapy. You know, Clone Walton has now been forced into therapy, and he's able to start processing what he's done, and it makes you a better person."

He continued, "Thoughtless people get away with a lot. No, that's not an excuse. You need to be informed, especially if you're in a position of power. And this is how it mirrors today, right now. If you don't understand what you're doing, you're going to hurt people really, really bad. And if you're continuing to do it for your ego, God save you. I don't even know how you're going to recuperate."

It's these elements of genre, human growth, and real-world pertinence that make Simpson so happy to be a part of Black Mirror. "Storytelling is such the fireside, universal, shared experience," he mused, adding, "It's about community. It's about understanding ourselves, and it is about really enjoying the time passing. So that's what Black Mirror is to me."

Black Mirror Season 7 is streaming now on Netflix.