"Meet Captain Underpants! His Identity is so secret even he doesn't know who he really is!"

Captain Underpants is a fictional character in the popular children's book series Captain Underpants and the eponymous character. He is the alter ego of Mr. Krupp created by George

Captain underpants flying

and Harold. He is the tritagonist of the Captain Underpants book series.

He and his alter ego are voiced by Ed Helms in the film Captain Underpants: The First Epic Movie.


The Adventures of Captain Underpants

Captain Underpants is originally a superhero created by George and Harold in their comics. After the two hypnotize their principal, they decide to have a little fun and goof around with the Hypno-Ring. They hypnotize Mr. Krupp into thinking he is a chicken, then a monkey, then Captain Underpants. Unfortunately for them, Mr. Krupp thinks he truly is Captain Underpants and jumps out the window to fight crime. His first stop is at a bank. The two robbers are paralyzed with laughter upon seeing him and are promptly arrested. Captain Underpants also irritates a police officer who tries to arrest him, but is saved by George and Harold. The three also witness two robots stealing a large crystal. Captain Underpants tries to stop them, but his cape gets caught on their man. He is dragged to an old abandoned warehouse, with George and Harold clinging onto his feet. There they meet Dr. Diaper, who has Captain Underpants tied up, but George and Harold escape. Dr. Diaper begins powering up his machine to take over the world. George and Harold destroy the robots and free Captain Underpants. Dr. Diaper attempts to stop them, but Captain Underpants covers his underwear over Dr. Diaper's face, rendering him defenseless (he has to wear a barrel after that). All four escape the explosion of the Laser-Matic 2000, and Dr. Diaper is taped to the flagpole at the police station. George and Harold have Captain Underpants get dressed into Mr. Krupp's clothes and attempt to turn him back into Mr. Krupp, but they have lost the manual and are unsure how to do so. In desperation, George dumps water on the hero's head, turning him back into Mr. Krupp. However, as the result of that, the Captain Underpants personality remains and Mr. Krupp will turn back into Captain Underpants at a snap of a finger.

Captain Underpants is portrayed much the same way as his book self, though he is less intelligent than his movie counterpart as he believes that a mime is trapped in a box and he places an old lady in a tree along with her cat instead of helping the cat out of the tree like she wanted.


  • In Book 3, its revealed that he knows of his missions and heroics in the Treehouse Comic books George and Harold wrote of him. In the film in reminisces about his missions and heroics as well as he reads the comics about himself.
  • In the film He remembers his Plunger he used to fight the toilets in book 2.
  • Though he has no idea of who his alter ego Mr. Krupp is, he knows where his office in the school is, and where his house is located. But in the movie you will see him pretending to be Mr. Krupp but not in a mean kind of way but more nicer like Mr. Krupp (who is Captain Blunderpants) in the alternate universe.
  • The film is most likely going to be more focused on him and his alter ego more than the Homemade Comic version him in the Treehouse Comic books.
  • He in the Treehouse Comic books has no identity so night and day he watches all over the city in case something happens and he will be there, ready to save the day.
  • In the Treehouse Comics version, it is revealed in Book 5 that he is from a planet called Underpanty World. Since the Planet was ending due to the Wedgie Warlords using the giant can of spray starch, his parents named Daddy Long Johns and Princess Pantyhose sent him to earth before the people on the planet perished by the spray starch.
  • In the comic, he swallowed some kind of Amulet that was going to be used to protect his home planet from spray starch.
  • In the comic books by Treehouse Comics, Inc, his underwear is not just regular underwear, but a special kind he uses, because he can click a button and a roll of toilet paper will come out and he will use is to swing on, or tie his villains up. Or a tiny toilet to squirt villains in the face.
  • The metaphor he uses to help restore his powers is "I SUMMON THE POWER OF UNDERPANTY WORLD!"
  • George and Harold only learn how to transform Captain Underpants in the end of the book when they splash him in the face with water, unaware at the time that snapping their fingers will turn Mr. Krupp back into Captain Underpants and that it wasn't a permanent solution to returning Mr. Krupp to normal. But in the movie, George and Harold catch on more quickly and even have fun transforming Mr. Krupp into Captain Underpants and vice versa.
  • It's unknown how Mr Krupp is able to turn back into Captain Underpants right after he was splashed with water then hears the snap of a finger again. but in the book If Mr Krupp's face and or head is still too wet he cannot change into Captain Underpants unless his face and head are dry.


  • Superhuman Strength
  • Flight
  • The power to overcome Spray Starch
  • Wedgie Power
  • 100% Cotton-Powered Vision
  • Superhuman Durability.
  • Thiccness.


  • Water to face (in real life)
  • Spray Starch (Comic Book)
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