Invincible Season 4 is here. The first three episodes dropped simultaneously on Prime Video on March 18, 2026, at 3 a.m. ET, with new episodes rolling out weekly through the season finale on April 22, 2026. The season runs eight episodes total, matching the length of Seasons 2 and 3, and brings back the full main cast alongside three major new additions who comic readers have been waiting to see voiced since the show began.
If you’re new to the series or just can’t place where you know these voices from, this guide breaks down every major actor, their character, and the roles that made them famous before they joined one of the best animated shows on television right now.
Who Voices Mark Grayson / Invincible in Season 4?
Steven Yeun voices Mark Grayson, and he has been the anchor of this show since the pilot. Most people know him as Glenn Rhee from The Walking Dead, a role he held from 2010 to 2016. What’s less discussed is how completely different the energy is here. Glenn was reactive and warm. Mark is angrier this season, more aggressive, more willing to cross lines. Yeun has been voicing this character since 2019 production began, which means he’s been living with Mark’s arc longer than most fans realize.
Who Voices Nolan Grayson / Omni-Man?
J.K. Simmons voices Omni-Man, and the casting has always been a bit of a masterstroke. Simmons won the Academy Award for Best Supporting Actor for Whiplash in 2015, playing an abusive music instructor. That same capacity for portraying a figure who is simultaneously magnetic and terrifying is exactly what Omni-Man requires.
He also played J. Jonah Jameson across multiple Spider-Man films, which makes his presence in a superhero animation feel earned rather than stunt casting. In Season 4 he teams up with the Coalition of Planets against the Viltrumite Empire, fighting against the very empire he once served.
Who Voices Atom Eve / Samantha Eve Wilkins?
Gillian Jacobs voices Atom Eve, and if you watched Community on NBC from 2009 to 2015, you know her as Britta Perry. The contrast between that comedic, slightly self-righteous character and Atom Eve could not be sharper. Atom Eve is one of the most powerful beings in the Invincible universe, capable of rearranging matter at a molecular level.
The Season 3 finale nearly killed her, but the mid-credits reveal of Episode 3 in Season 4 reframes everything about her power fluctuations this season: she’s pregnant. Jacobs and creator Robert Kirkman have both described Season 4 as particularly intense for her character.
Who Voices Thragg, and Why Is That Casting Such a Big Deal?
Lee Pace voices Thragg, the Grand Regent of the Viltrumite Empire and the single most powerful Viltrumite alive. His casting was announced at New York Comic-Con on October 10, 2025. Pace is best known for playing Ronan the Accuser in Guardians of the Galaxy and Joe MacMillan in the AMC series Halt and Catch Fire. He also leads the Apple TV+ sci-fi series Foundation as Brother Day.
Thragg is widely considered the defining villain of Kirkman’s original comic run, and getting an actor of Pace’s caliber, with his specific quality of cold authority, is the kind of match that makes sense the moment you hear it. He first appears in Episode 2, titled “I’ll Give You the Grand Tour.”
Who Voices Dinosaurus in Invincible Season 4?
Matthew Rhys voices Dinosaurus, announced in July 2025. Rhys is an Emmy Award winner for his lead role in The Americans on FX, where he played KGB spy Philip Jennings across six seasons from 2013 to 2018. The role demanded he be simultaneously believable as a suburban travel agent and a trained Soviet operative.
That same dual-nature quality translates directly to Dinosaurus, also known as Dr. David Anders, a genius scientist and eco-extremist who transforms into a massive red dinosaur and believes in culling humanity to save the planet. He shows up in Episode 1 targeting Invincible for not going far enough during the Invincible War.
Who Voices Universa in Season 4?
Danai Gurira voices Universa, confirmed in January 2026. Gurira is best known as Michonne in The Walking Dead and Okoye in the Black Panther films and Avengers: Endgame. She also wrote the Tony Award-winning play Eclipsed. Universa is a powerful intergalactic warrior who appears in the Season 4 premiere, attempting to drain the world’s power supply.
She and Gurira are both known for a specific quality of controlled, purposeful force, which makes the casting feel less like a surprise and more like an inevitability. Episode 1 handles her appearance efficiently, but she’s a character with more complexity than a single episode suggests.
Who Voices Cecil Stedman, and What’s His Role in Season 4?
Walton Goggins voices Cecil Stedman, the morally grey director of the Global Defense Agency who has been pulling strings since Season 1. Goggins is one of the most recognizable character actors working today: Boyd Crowder in Justified, Shane Vendrell in The Shield, and more recently the Ghoul in Amazon’s Fallout. The detail most people skip is that Cecil is currently keeping Conquest, voiced by Jeffrey Dean Morgan, locked in an underground chamber following the Season 3 finale’s revelation that he survived. That power dynamic between those two characters is one of the quietly loaded threads heading into Season 4.
Who Voices Oliver Grayson / Kid Omni-Man?
Christian Convery voices Oliver Grayson, and the casting detail worth knowing is that Convery is 16 years old, making him one of the rare voice actors whose age roughly tracks with the character he plays as that character ages on screen. He’s best known for his starring role in Netflix’s Sweet Tooth, and more recently appeared in Guillermo del Toro’s 2025 film as young Victor Frankenstein, a project that won the Academy Award for Best Picture. Oliver plays a smaller role in the first three Season 4 episodes compared to Season 3, but his arc is expected to expand significantly once Omni-Man’s storyline with the Coalition accelerates.
Which Other Returning Cast Members Should Fans Know?
The deeper roster is stacked with recognizable names. Seth Rogen voices Allen the Alien, a character who started as a comedic punching bag in Season 1 and has become a crucial figure in the war against the Viltrumite Empire. Sandra Oh as Debbie Grayson brings the same emotional precision she showed in Killing Eve and Grey’s Anatomy.
Jonathan Banks, Breaking Bad’s Mike Ehrmantraut, plays Brit, now leading the Guardians of the Globe. Mark Hamill, who voiced the Joker for decades in DC animation, voices Art the tailor. Ross Marquand plays Robot/Rex. Ben Schwartz, best known as Jean-Ralphio in Parks and Recreation, voices Shapesmith, and his comedic timing makes every scene with that character work better than it has any right to. Robert Kirkman himself wrote Episode 4, which is the kind of production detail most season guides bury entirely.
What Makes the Invincible Season 4 Cast Different From Other Animated Shows?
Most animated superhero series chase name recognition in casting without thinking about whether an actor’s actual presence fits the character. Invincible has done something consistently across four seasons: it finds actors whose real-world energy and baggage aligns with what the character needs, not just actors whose names look impressive in a press release.
Lee Pace was not an obvious choice for Thragg until you think about his work in Foundation and Halt and Catch Fire, both of which required him to project ideology and violence through stillness. Matthew Rhys’s Dinosaurus works because Rhys spent six years playing someone who believes he’s right about everything.
Danai Gurira’s Universa works because Gurira has spent a decade playing warriors who fight for something larger than themselves. The show premieres its first three episodes March 18, 2026, with the finale landing April 22, and Season 5 is already confirmed, announced at San Diego Comic-Con in July 2025 before Season 4 had even aired a single frame.
