You probably know the drill by now. Two fourth-graders, a cranky principal, and a superhero who fights crime in his drawers. It’s absurd. The Epic Tales of Captain Underpants on Netflix took Dav Pilkey’s legendary books and turned them into a fast-paced, meta-humor fever dream that honestly hits harder for adults than it has any right to. But have you ever actually looked at the Captain Underpants show cast?
It’s not just a bunch of random voice actors.
The lineup is actually a weirdly perfect mix of comedy heavyweights, seasoned voice legends, and character actors you’ve definitely seen in live-action sitcoms. DreamWorks didn’t just throw darts at a board; they built a vocal ensemble that could handle the frantic, fourth-wall-breaking energy of Jerome Horwitz Elementary. If you’re sitting there wondering why George sounds so familiar or why the villain of the week has such impeccable comedic timing, you’re in the right place.
The Stars of the Show: George and Harold
In the original 2017 movie, we had Kevin Hart and Thomas Middleditch. Big names. Expensive names. When the show transitioned to Netflix, the Captain Underpants show cast shifted to specialized voice talent who, frankly, feel a bit more grounded in the roles.
Ramone Hamilton takes on George Beard. He’s got that specific "ideas man" energy. Hamilton isn't just some kid; he’s a prolific young performer who also worked on The Grinch and Will & Dewitt. Then you’ve got Max Mittelman as Harold Hutchins. Mittelman is a titan in the voice-over world. If you follow anime or gaming at all, you know him as Saitama from One Punch Man or Ryuji from Persona 5. Hearing a guy who usually plays intense, world-ending heroes voice a goofy fourth-grader with a bad haircut is one of those industry quirks that makes the show better.
They have actual chemistry. That’s rare in voice acting where people often record in separate booths at different times. You can feel the friendship. It’s the engine that makes the whole show run.
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Nat Faxon as Captain Underpants (and Mr. Krupp)
Let’s talk about the big guy.
Nat Faxon had some massive shoes to fill—or rather, a massive cape to wear—after Ed Helms voiced the character in the theatrical release. Faxon is an Oscar winner. Yes, seriously. He won for writing The Descendants. But as part of the Captain Underpants show cast, he does something brilliantly subtle. He manages to make Mr. Krupp genuinely miserable while making Captain Underpants feel like a golden retriever in a human body.
The tonal shift when Krupp gets splashed with water is impressive. Faxon leans into the nasal, high-strung frustration of a man who hates his life, then pivots to the booming, misplaced confidence of a hero who doesn't understand how physics works. It's a masterclass in range.
Honestly? Faxon might be the MVP of the entire series.
The Supporting Players You Definitely Recognize
The school isn't just George, Harold, and Krupp. The hallway is filled with some of the best "hey, it's that guy" actors in the business.
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- Erica Wang: Voiced by Jay Gragnani. Erica is the smartest person in the room and she knows it. Gragnani gives her that perfect "I'm surrounded by idiots" dry wit that anchors the chaos.
- Melvin Sneedly: Jorge Diaz brings the perfect amount of nasal arrogance to George and Harold’s nemesis. Diaz is everywhere—Elena of Avalor, Lost in Oz, and even Days of Our Lives.
- The Teachers: This is where the Captain Underpants show cast gets really fun. You have Sean Astin (yes, Samwise Gamgee himself) acting as the Narrator. His voice provides that "Nature Documentary" gravitas that makes the ridiculous visuals even funnier.
Then there’s the guest stars. The show loves to bring in people like Jim Rash, who plays Mr. Ree. If you’ve watched Community, you know Rash is the king of playing slightly unhinged authority figures. Having him in the mix adds a layer of "prestige comedy" to a show that literally has a villain named Dr. Poffenpants.
Why the Voice Casting Matters for SEO and Success
People search for the Captain Underpants show cast because the show doesn't talk down to kids. It uses sophisticated comedic tropes. When you have a cast that understands improv and timing, the jokes land differently.
Think about the "Comic Book" segments. The show switches animation styles constantly. The actors have to adapt their performances to match a 2D doodle or a claymation sequence. It requires a specific type of flexibility that "A-List" celebrities often lack. The Netflix cast are specialists. They understand how to "squeeze" a word to make a gag work even if the animation is just a still frame.
The Impact of Sean Astin’s Narration
We need to circle back to Sean Astin.
His presence in the Captain Underpants show cast is a stroke of genius. He’s the "straight man" to the entire universe. By narrating the boys' exploits with the same intensity he might use for a high-fantasy epic, he elevates the stakes. It creates a comedic dissonance. When Astin describes a giant toilet monster with the solemnity of a war historian, that’s where the "human quality" of the writing and acting shines through.
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Behind the Scenes: How They Record
Most people think voice acting is just reading lines. For this cast, it’s a lot of physical work. Because the show is so high-energy, the actors often talk about being "wiped out" after a session. You can’t voice Captain Underpants while sitting still. You’re shouting, you’re laughing manically, and you’re making weird mouth noises for the sound effects team to use.
The production team at DreamWorks TV, including developers Todd Grimes and Peter Hastings, pushed for a "radio play" feel. This meant the Captain Underpants show cast was encouraged to riff. If a line was funnier when Max Mittelman stumbled over it, they kept it. That’s why the dialogue feels so fast and snappy compared to other Saturday morning cartoons.
What to Do Next if You Love the Cast
If you’ve finished the series and the specials (like the "Epic Choice-o-Rama" interactive episode), your next step shouldn't be to just wait for a revival that might not happen. Instead, follow the careers of these specific actors.
- Check out Max Mittelman’s work in Persona 5 or One Punch Man if you want to see his incredible range in more "serious" (but still fun) roles.
- Watch Nat Faxon in The Way Way Back—he co-directed and wrote it, and it shows off the same comedic sensibilities that make Krupp so relatable.
- Look for Jorge Diaz in Fast & Furious Spy Racers.
The Captain Underpants show cast represents a specific era of DreamWorks animation where they valued comedic chemistry over star power. It’s the reason the show has such a massive following among older audiences who appreciate the craft behind the poop jokes. Go back and re-watch an episode like "The Terrible Tales of the Terrible Taffy" and pay attention to how Faxon modulates his voice when he's talking to the taffy. It’s brilliant work.
Understanding the people behind the mic changes how you watch the show. It’s not just a cartoon; it’s a group of incredibly talented comedians having the time of their lives.
Practical Takeaway: If you are a parent or a fan, look for "Behind the Mic" clips on the DreamWorks YouTube channel. Seeing Nat Faxon and the boys in the booth provides a whole new level of appreciation for the vocal gymnastics required to bring Jerome Horwitz Elementary to life.