If you’ve spent any time at all watching the chaotic, sweat-drenched, and hilariously uncomfortable world of Bridgeton Middle School, you know that Andrew Glouberman is basically the poster child for puberty gone wrong. He’s awkward. He’s prematurely balding. He’s... well, he’s a lot. But the voice behind him is so distinct that it’s impossible to imagine anyone else in the booth.
So, who voices Andrew in Big Mouth?
The answer is John Mulaney.
Honestly, it’s a match made in comedy heaven. Mulaney, known for his sharp suits and "tall child" energy, brings a specific kind of frantic, high-pitched desperation to Andrew that makes the character’s most humiliating moments actually watchable. It’s not just about the lines; it’s about that cracking voice and the way he says "maaaaaaaa-sturbation" like it’s a four-syllable tragedy.
The Chemistry Between John Mulaney and Nick Kroll
You can’t really talk about Mulaney voicing Andrew without mentioning his real-life best friend, Nick Kroll.
Kroll is the mastermind who co-created the show (alongside Andrew Goldberg, Mark Levin, and Jennifer Flackett). He also voices Nick Birch, Andrew’s best friend. This isn't just a professional gig for them. These guys have been working together for decades. If you ever saw their Broadway show Oh, Hello!, you already know they have a shorthand that most actors would kill for.
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In Big Mouth, that history translates into a friendship that feels incredibly lived-in. When Andrew and Nick are screaming at each other or having a heart-to-heart about their changing bodies, you're hearing two guys who actually know each other's secrets. It adds a layer of authenticity to the show that keeps it from being just a series of gross-out jokes.
Why Mulaney’s Andrew Hits Different
Most adult actors trying to sound like kids end up sounding... weird. Like they're trying too hard to be "youthful."
Mulaney doesn't really do that. He basically just uses his natural voice but cranks the anxiety up to an eleven. There’s a specific "cranky old man" quality to his delivery that contrasts perfectly with the fact that Andrew is a thirteen-year-old boy. It’s a choice that makes Andrew’s horniness and social failures feel even more absurd.
Beyond the Main Role: Other Characters Mulaney Voices
While Andrew is his main "job" on the show, Mulaney hasn't just stuck to one script. Like much of the cast, he lends his voice to a variety of weird side characters throughout the eight seasons.
- Babe the Blue Ox: A surreal, deep-voiced version of the folk legend.
- Detective Florez: A recurring character in some of the show's more genre-bending episodes.
- Grandpa Andrew: Because seeing Mulaney voice an elderly version of himself just makes sense.
It’s a testament to his range. Sure, he’s mostly known for that "polite choir boy" persona in his stand-up, but in Big Mouth, he gets to be absolutely disgusting. And he clearly loves it.
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The End of an Era (2017–2025)
It’s hard to believe, but Big Mouth officially wrapped up its run on Netflix in May 2025.
The eighth and final season saw the kids finally heading toward high school, and it felt like the right time to say goodbye. Nick Kroll has mentioned in interviews that adolescence has a natural shelf life. You can't stay thirteen forever, even in animation.
The final season was a bit of a victory lap for Mulaney. We saw Andrew maturing—slightly—and finally coming to terms with the monster on his shoulder. The show ended with a total of 81 episodes, making it one of the longest-running original scripted series in Netflix history. That’s a lot of hours of John Mulaney screaming about hormones.
Real-Life Parallels
There’s something kinda poetic about Mulaney’s journey alongside the character. During the show's run, Mulaney went through some massive life shifts—rehab, a divorce, becoming a father, and a major career comeback with his special Baby J.
While Andrew is a fictional middle schooler, that raw, "life is messy" energy definitely bled into the performance. Fans often point out that as Mulaney’s personal life became more public and complicated, his portrayal of Andrew felt even more vulnerable and "real," even when he was doing something totally gross.
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What’s Next for the Big Mouth Universe?
Even though the main show is over, the impact of the voice cast remains huge. We already had the spin-off Human Resources, which brought back many of the same voices, and there are always rumors about "sequel" series that might follow the kids into college or adulthood.
If you're missing that specific Mulaney brand of humor, you've got plenty of options. He’s been busy with his Netflix talk show Everybody’s in LA and his continued voice work in major films like Spider-Man: Into the Spider-Verse (where he's the hilarious Spider-Ham) and Puss in Boots: The Last Wish.
Next Steps for Fans:
- Watch the Final Table Read: Netflix released a live table read of the series finale, "The Great Unknown." It’s worth watching just to see Mulaney and Kroll riffing in person.
- Check out Oh, Hello on Broadway: If you want to see where the Mulaney/Kroll chemistry started, this is essential viewing on Netflix.
- Listen for the Cameos: Re-watch the early seasons of Human Resources to catch Mulaney popping up in unexpected places.
Andrew Glouberman might be gone from our screens, but John Mulaney's voice is basically etched into the history of adult animation now. He took a character that could have been a one-note joke and turned him into a weirdly relatable, deeply anxious hero for every former "awkward kid" out there.