Why Invincible keeps outdoing itself in season 4: 'Everything has to be an escalation'

Four seasons later, the animated spin on Robert Kirkman’s Image Comics series still delivers that delightfully disturbing combo with each new episode. But the team behind Invincible says the only reason it all works is because, at the center of the mayhem, there's a realistic human being full of insecurities and self-doubt.

Well, human being is pushing it. Mark Grayson aka Invincible (Steven Yeun) is technically half human half alien (the alien half comes from his father Nolan aka Omni-Man, a member of the imperialist Viltrumite species voiced by J.K. Simmons). But this far-out premise just pushes the show’s creators to keep Mark’s emotions as grounded and realistic as possible in the face of escalating, Earth-threatening challenges, which in season 4 range from a Martian hivemind invasion to a brewing civil war in literal Hell.

“It's a realistic take on what it would be like to be a young superhero,” Kirkman tells Polygon.

“I know it's a fantastical situation, but to Mark, it's real,” adds his co-showrunner, Simon Racioppa. “He's the one who had to live through this. How would this affect someone?"

That’s the question at the heart of Invincible, and it's one that Racioppa and Kirkman tackle head-on in season 4. As both the threats and the violence Mark faces continue to ramp up, so does his own ambivalence about his ability to do what’s right under immense pressure. The show’s latest batch of episodes are full of introspection, drama, and an intergalactic war between the ragtag forces of good and a fascist army of uber aliens.

As Kirkman puts it: “Everything has to be an escalation.”

“More scope, more scale, and higher stakes”

Invincible season 3, which ended a year ago in March 2025, culminated with two big battles. First, Mark had to defeat an army of alternate reality versions of himself, all of whom were genocidal supervillains. And then, as if that wasn’t enough, he faced down a powerful Viltrumite called Conquest (voiced by Yeun’s Walking Dead co-star Jeffrey Dean Morgan) in a battle that nearly took our hero out for good.

In other words, Invincible has been through a lot.

“All these events that he went through in season 3 have consequences on him mentally and physically, and on his relationships,” Racioppa says. “These things have weight to them. They matter. And we have to make sure that we stay true to that as the show goes forward.”

Facing down his own evil multiversal variants, in particular, leaves a lasting impression on Mark that he carries into season 4. Not just because a bunch of guys who look just like him killed countless innocent civilians, but because of what they reveal about his own true nature.

“Everybody has those what-ifs,” Kirkman says. “What if I had made this decision? What if I had made that decision? To be confronted with the factual knowledge that, in a lot of those scenarios, you turn out to be a bad guy is really going to wear on him for the duration of the show.”

Yeun takes it a step further. His character isn’t just traumatized by what he witnessed, but has been forced to wonder if it’s only a matter of time before he goes down that same dark path.

“He's always wrestling with the idea of: Am I destined to just become what I've witnessed or can I change my fate?” Yeun says. “Robert dropped the most base, largest, paradoxical, difficult, moral, existential quandary: Do I have free will or is it written?”

You can expect Mark to face even tougher challenges in Invincible season 4. While the first few episodes follow a familiar villain-of-the-week formula as our hero faces various enemies on Earth, the focus eventually turns toward a galaxy-sprawling war between the Viltrumites and the Coalition of Planets (an alliance of friendly planets and aliens that includes both Mark and Nolan, along with various other superheroes and soldiers).

Just don’t expect any of it to be easy.

“Every season we want to put the guy through his paces,” Kirkman says. “Watching him struggle and make mistakes and get the crap absolutely beat out of him is very important. Every season has more scope, more scale, and higher stakes. And now we've got the Viltrumite War and big things coming. It’s important to us that everything continues to ramp up from season to season.”

“Not just space boogiemen”

Invincible season 4 reveals more about the Viltrumites than ever before, offering a surprisingly nuanced perspective on the Nazi-like aliens. For Kirkman and Racioppa, this isn’t some trick to make you sympathize with the enemy — it’s just good writing.

“You want your antagonist to always have some level of humanity and believability to them,” Kirkman says. “When you can identify their goals while also recognizing the wrongness of them, that makes your characters that much more compelling.”

“We wanted to illuminate them a little bit and make sure that they're not just space boogiemen,” Racioppa adds.

Omni-Man goes through a particularly striking transformation, one that began in earlier seasons but reaches a major tipping point in season 4 as he begins to shed his Viltrumite instincts for something more human. You can see it particularly in a mid-season episode where Nolan apologizes to one of his old enemies. The look of shock on their face as they hear those words conveys just how much his character has changed.

Thanks to a mix of careful storytelling and Simmons’ nuanced voice acting, Omni-Man evolved from the show’s presumed villain to something almost resembling a hero.

“He's one of the most complex characters in the show,” Kirkman says. “It's something J.K. Simmons handles so exceptionally well. He has such a warmth to his character. He's so fatherly, but also extremely intimidating, and he's able to play all of those different levels.”

Nolan still has a long way to go, however, and the showrunners aren’t ready to reveal how that transformation will end (although you could always read ahead in the comics to find out).

“The character is definitely growing and evolving,” Kirkman says. “He's gone a long way and he's still got a long way to go. A lot of people use the term redemption arc when they talk about this season, but we’ve been very careful to say maybe it’s the beginning of one. We don't know if that arc is going to get completed or will ever be completed.”

“We know where the finish line is”

Invincible is already renewed through season 5, but it’s unclear exactly when the series will end. Kirkman and Racioppa know where the story ultimately needs to go (the comic has already concluded, after all), but how they get there will depend on how many more seasons Amazon is willing to pay for.

“We have a vague roadmap of what parts of the comic would fall in what seasons,” Kirkman says. “So we know where theoretically the final episode of the show would be and what it would be, and what the season 5 finale, season 6 finale, and so on and so forth.”

That said, the showrunners also have a backup plan in case they suddenly need to sprint to the series finale earlier than planned.

“It's malleable if we need to adjust,” Kirkman says, “because the comic was completed, and the goal is to adapt the entire comic. We won’t be caught off guard.”

“Stories aren't complete if they don't have an end,” adds Racioppa. “We know where the finish line is, and hopefully if people keep on watching, we'll get to go right to the end.”