Captain Underpants Costume

Q: What are Captain Underpants's most famous quotes?

His introduction from the 2017 movie: 'Underpants? Check. Captain? Also check. I'm pretty sure I'm Captain Underpants.' His battle cry, stretched out over several seconds with total sincerity: 'Tra-la-laaaaaaaaa!'

Captain Underpants Halloween Costume Items

Captain Underpants Halloween costume with white underpants, red cloak, bald cap, and toilet plunger prop laid out

Captain Underpants Costume Items

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Captain Underpants Dav Pilkey DreamWorks Comedy Superhero

1 Red Cloak (essential)This is what turns “guy in his underwear” into Captain Underpants. It should be short and simple, tied at the neck like a kid made it out of a curtain, not a long dramatic cape with a stiff collar. A cheap satin one is closer to correct than anything that looks well made.
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2 Toilet PlungerCaptain Underpants doesn’t fight with fists, he improvises with whatever’s around. Holding a plunger like a weapon sells the joke on its own without needing to explain anything.
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3 White Underpants (essential)The costume you’re actually wearing. Plain white briefs, not boxers, not compression shorts. Stark white is what reads at a glance; anything patterned or off-white and people will just think you forgot pants.
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4 Bald CapMr. Krupp is bald and pear-shaped, and the cap sells the before-and-after transformation joke. Warm the edges with a hairdryer before applying or they’ll start lifting a couple hours in.
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5 Captain Underpants BooksCheck your shelf or a library sale bin first.
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How to Style the Captain Underpants Halloween Costume

The cape is the first thing anyone clocks, since a grown man in white underpants and nothing else reads as a dare more than a costume choice. Get the plunger into your hand early, because standing around empty-handed just makes the underwear look accidental instead of intentional. If the cape is too long or too stiff, the whole thing drifts from “kid’s book hero” toward “guy who lost a bet at the party.”

In the movie, his idea of a superhero entrance is checking off his own outfit out loud: “Underpants? Check. Captain? Also check. I’m pretty sure I’m Captain Underpants.” He follows it with his battle cry, a long stretched-out “Tra-la-laaaaa,” delivered with total sincerity while doing nothing remotely threatening. Do that entrance instead of just standing there in a cape.

Order the short cape, not the long one

Most capes sold online are cut knee-length or longer, built for dramatic superhero photos. That’s wrong here. Captain Underpants ties on a cape made from a curtain, so look for something short that stops around mid-back, or it’ll drag and catch on chairs all night.

Use the plunger as your icebreaker

At a party where half the room hasn’t read the books, holding a plunger like a weapon is a better opener than standing in your underwear hoping someone places the reference. People will ask what the deal is, and that’s easier than explaining unprompted.

Captain Underpants Group Halloween Costume Ideas

Rivalry Idea

Captain Underpants & Professor Poopypants

Excellent hero-and-villain pairing, not a romantic one, and it doesn’t need explaining. A goofy underwear-clad hero next to a wild-haired mad scientist reads instantly, even to people who’ve never opened the books. The visual contrast does all the work here.

Captain Underpants Professor Poopypants

Duo Idea

Captain Underpants & George Beard

Strong pairing if your group knows the source, since George on his own is just a kid in regular clothes with no costume markers. Next to Captain Underpants he reads as the co-creator standing beside his own invention, which lands with anyone who’s read the comics-within-the-books.

Captain Underpants George Beard

Group Idea: Captain Underpants Core Cast

Captain Underpants, George Beard, Harold Hutchins, Professor Poopypants, Wedgie Woman

Might work, but recognition depends on how deep into the books your crowd went. George and Harold don’t have distinct costume elements of their own, so without Captain Underpants standing next to them, they just look like two kids. Wedgie Woman is a real book five villain, not a random addition, but she’s also the character least likely to be recognized by anyone who only saw the movie.

Captain Underpants George Beard Harold Hutchins Professor Poopypants Wedgie Woman

Group Idea: Comedy Superheroes and Supervillains

Captain Underpants, Orgazmo, Megamind, Dr. Horrible, The Tick, Metro Man

Might work, but the audiences barely overlap. Orgazmo is an R-rated Trey Parker film most kids have never heard of, while Metro Man and Captain Underpants come from movies made for them. If your group spans that age gap, this reads as “assorted superhero parodies” rather than a single coherent joke, which is fine at an adult party and confusing at a family one.

Orgazmo Megamind Dr. Horrible The Tick Metro Man

Person dressed as Captain Underpants in white briefs and a red cloak holding a toilet plunger prop

Captain Underpants Halloween Costume DIY Tips

Building the Look

This one is cheap almost no matter how you build it. Most of the pieces are things you already own or can grab secondhand.

White underpants: check your drawer first, seriously.
Red cloak: an old curtain or red pillowcase, cut and tied at the neck, is closer to canon than a store-bought superhero cape.
Toilet plunger: buy a new one. Don’t be the person who brought a used plunger to a party.
Bald cap: theatrical supply stores or costume shops. The cheap ones look shiny and fake under bad lighting, so test it before the night of.
Books: library sale bins are full of these.
Optional sock puppet: George and Harold’s low-tech DIY spirit is half the joke, so a plain sock with button eyes fits the character even without a specific script.

Playing Captain Underpants at the Party

He’s not cool, and that’s the entire point. Total sincerity, zero self-awareness, dopey confidence about a situation that clearly doesn’t call for a superhero.

Introduce yourself the way he does in the movie: check off your own outfit out loud, underwear and all.
Strike a heroic pose at random moments for no reason. The lack of a reason is the joke.
Pull a harmless prank, like a whoopee cushion. Skip anything that actually startles or embarrasses someone.
Yell “Tra-la-laaaaa” instead of a normal greeting. It gets old by hour three. Do it anyway.

Captain Underpants Halloween Costume: FAQ

How do I dress like Captain Underpants for Halloween 2026?

White briefs and a red cloak tied at the neck are the whole costume. Add a bald cap for the Mr. Krupp transformation gag, carry a toilet plunger as a weapon, and bring a Captain Underpants book if you want people to place it instantly instead of guessing.

Is the Captain Underpants costume still a good choice for Halloween 2026?

Yes, and not just out of nostalgia. The books are still in print and still handed to reluctant readers in elementary schools, and the Netflix series keeps the character in front of kids who never read the originals. Adults may need a second to place it, but any kid at the party will know exactly who you are.

What are Captain Underpants’s most famous quotes?

His introduction from the 2017 movie: “Underpants? Check. Captain? Also check. I’m pretty sure I’m Captain Underpants.” And his battle cry, stretched out over several seconds with total sincerity: “Tra-la-laaaaaaaaa!”

Who voices Captain Underpants in the 2017 movie?

Ed Helms voices both Mr. Krupp and his hypnotized alter ego in Captain Underpants: The First Epic Movie. Kevin Hart voices George Beard and Thomas Middleditch voices Harold Hutchins (IMDb).

What is the Captain Underpants Netflix series called?

The Epic Tales of Captain Underpants, a DreamWorks-produced series that ran on Netflix from 2018 to 2020. It’s a separate continuity from the 2017 movie, with its own voice cast.

Do I need a bald cap for this costume to work?

No, but it helps. Mr. Krupp is bald, and the cap sells the before-and-after transformation joke. Without it you’re still clearly Captain Underpants, just a hairier version.

Should I carry a prop like a plunger with this costume?

It’s optional but worth it. Captain Underpants doesn’t carry real weapons, so a plunger held like one gets the joke across and gives you something to do with your hands at a party where not everyone has read the books.