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The Mystery

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The Mystery is the thirteenth episode of season one of The Amazing World of Gumball.


The kids at school try to solve the mystery of who stuffed Principal Brown in Gumball's locker.


The episode starts with Gumball unlocking his locker while talking to Darwin about cheese and cake. When Gumball opens his locker, something wrapped in toilet paper falls out. A crowd gathers, commenting on the gross smell and look of it. As Tobias pokes it with a stick, Miss Simian appears, angrily asking what the fuss is all about. She, too, is grossed out by the object. After ripping off part of the toilet paper wrapping, it is revealed that Principal Brown was the one wrapped up, and that he was also shaved and painted green. Miss Simian cradles the principal, then demands to know who caused this to happen. No one owns up, so she orders all of them to get into her classroom, including Rocky, who was cleaning. Miss Simian threatens to put everyone in detention if no one admits to doing it by the time she gets back.

After she leaves, Gumball asks everyone for their opinion on the subject. Sussie saw Principal Brown after school, which means that whatever happened to him occurred after school. There were only four people who stayed after school - Gumball, who had detention, Penny, who was doing cheerleader stuff, Rocky, who was cleaning, and Darwin who was unable to remember. Banana Joe convinces everyone that it was Gumball, because the Principal was found in his locker, which causes everyone to glare at Gumball. He denies doing it, but promises to find out who did. He first tries to find the culprit by telling whoever did it to raise their hand. Obviously, no one raises their hand. He then tries to get everyone who didn't do it to raise their hand. Everyone raises their hand except for Alan, which causes everyone to look at him. Gumball accuses him, but Alan, annoyed, bumps Gumball and says that he doesn't have any hands. Penny tells Gumball that he should look for clues.

The first clue Gumball finds is, coincidentally, the green paint splats on Penny's pom-poms. He invents a humorous story to describe why Penny would do this to Principal Brown, but Penny reminds him that he saw her after school, which means she couldn't have done it.

The next clue was a patch of missing hair on Rocky Robinson's hand. He again invents a humorous motive behind the assault on Principal Brown, but this story is also proven false.

The third clue was a sheet of toilet paper stuck to Darwin's shoe. Gumball has trouble calling out his best friend, but he painfully brings himself to do it. Darwin immediately admits to it, calling himself a monster. As Gumball closes the case, everyone reminds Darwin that he couldn't have done it, because they saw him on the bus after school. The toilet paper was stuck to his shoe all day.

Gumball was the only other person who stayed after school, which caused him to accuse himself, causing his classmates to turn on him. Miss Simian arrives just as he does this, which is enough proof for her to give him detention, but Gumball was able to buy himself some time by saying he was going to get a crucial piece of evidence. After a while, we hear Gumball running away and Miss Simian realizing he wasn't coming back. She offers a reward of no homework for whoever catches him, which leads to a big chase through the school.

Gumball escapes and bumps into Bobert, who was deactivated. Gumball turns him back on, and he says he knows who caused Principal Brown's injuries, which is when Gumball gets surrounded by his classmates, all eager to claim the no homework reward. Gumball begs Bobert to tell everyone who did it, and Bobert shows everyone a video, revealing exactly what happened. Principal Brown was walking down the hallway when suddenly, his office door flew open, leaving him dizzy. He then fell down the stairs, wrapping himself with a toilet paper trail that Darwin left behind, and slammed into Penny's wet painting, which covered him in green paint. Next, he fell face first into a puddle of hair-loss chemicals that Rocky spilled, which caused him to jump up in pain and fall down more stairs, right into Gumball's locker. Gumball just shrugged and walked away.

Everyone agreed that whoever opened the office door was the one responsible, so Gumball replayed Bobert's memory, zooming in on the person who opened the door. It is revealed to be Miss Simian. She erases Bobert's memory to stay innocent, causing Gumball and the rest to turn on her. As she walks away and taunts the children, Principal Brown opens his office door and pops out. The door hits Miss Simian, sending her flying out the window. The kids peek out the window to see Miss Simian getting run over by the ambulance that was called for Principal Brown. The episode ends with the kids flinching at the latter event.


Minor Characters


The gallery for "The Mystery" can be found here.


  • Penny: Somebody do something!
    (Tobias pokes the wrapped up object with a stick.)
    Miss Simian: What is going on here?! What are you poking - Eugghh! It looks like a wet diaper! (unravels the wrapped up object, revealing it is Principal Brown and gasps) Nigel!

  • Principal Brown: (after bring knocked out of the nurse's office window unintentionally by Gumball, and lands outside) "This is... (painful grunting noises) ...extraordinarily painful. This can't possibly get any worse." (bus backs-up and crushes him off-screen and camera shifts toward the students recoiling seeing Principal Brown being crushed.)

  • Gumball: Whoever did it raise your hand!
    (No one raises their hand.)
  • Gumball: Alright, whoever didn't do it raise your hand!
    (Everyone raises their hand, except Alan, the balloon. They all look at him.)
  • Alan: What?
  • Gumball: Aha! So you did it!
(Alan bumps him on the head.)
  • Alan: Dude! I don't have any hands!!

Darwin: Who could it be? All this suspense is making me sweaty.

  • Gumball: Why don't you wipe your brow with that toilet paper suspiciously stuck to the bottom of your foot? (gasps) CLUUUUUUE!

  • Darwin: "Don't worry, Ms. Simian! We just called an ambulance!"

(Ambulance backs-up and crushes Ms. Simian off-screen and camera shifts toward the students recoiling seeing her being crushed.)


  • It is possible for you to see Bobert at the top of the staircase during the part of the episode where everyone is going inside the classroom.
  • Alan's voice is different than how it sounded in "The Third." Same goes for Carmen, whose voice doesn't match up with the one heard in "The Pressure" and Bobert, whose voice has always been inconsistent.
  • This episode premiered in the U.K. as a sneak peek on May 2, more than two months before the air date of this episode in the U.S.
  • The crushing sound heard when Principal Brown and Miss Simian were hit by a vehicle is used in several games when a enemy is killed due to a headshot.
  • If going by British airings, this episode marks the first appearance of Sussie the Chin. The American airings had her first appearance in "The Ghost."
  • Goof: Darwin and Penny apparently didn't try to chase Gumball down, but mysteriously are caught up with him when Gumball presents the evidence.
  • Goof: When Bobert is first seen on stairs when everyone enters the classroom he appears to be fully activated, but later he is switched off.
  • Goof: On the first display of Bobert's memory, no one can be seen opening the door, but the second time shows the culprit quite clearly.
  • Goof:When Miss Simian is yelling "WHO DID THIS!!??", her face is a darker shade of gray than normal.
  • When the bald Principal Brown is seen without the toilet paper and paint on him, the last bit of hair on his scalp is yellow-green-red instead of its usual creamy tan.
  • Darwin and Penny are seen chasing Gumball down with the other kids. Though they's supposed to be trusting Gumball, they probably just wanted the no homework reward, but maybe in the end, because of their confidence in Gumball, have declined to capture him .

TheDVDSeason1 TheResponsibleSeason1 TheThirdSeason1 TheDebtSeason1
Episode 1
Episode 2
The Responsible
Episode 3
The Third
Episode 4
The Debt
TheEndSeason1 TheDressSeason1 TheQuestSeason1 TheSpoonSeason1
Episode 5
The End
Episode 6
The Dress
Episode 7
The Quest
Episode 8
The Spoon
ThePressure Season1 ThePaintingSeason1 TheLaziestSeason1 TheGhostSeason1
Episode 9
The Pressure
Episode 10
The Painting
Episode 11
The Laziest
Episode 12
The Ghost
TheMysterySeason1 ThePrankSeason1 TheGiSeason1 TheKissSeason1
Episode 13
The Mystery
Episode 14
The Prank
Episode 15
The Gi
Episode 16
The Kiss
TheParty Season1 TheRefundSeason1 TheRobotSeason1 ThePicnicSeason1
Episode 17
The Party
Episode 18
The Refund
Episode 19
The Robot
Episode 20
The Picnic
TheGoonsSeasonOne TheSecretSeason1 TheSockSeason1 TheGeniusSeasonOne
Episode 21
The Goons
Episode 22
The Secret
Episode 23
The Sock
Episode 24
The Genius
ThePoltergeistSeasonOne TheMustacheSeason1 TheDateSeason1 TheClubSeason1
Episode 25
The Poltergeist
Episode 26
The Mustache
Episode 27
The Date
Episode 28
The Club
TheWandSeason1 TheApeSeason1 TheCarSeason1 TheCurse season1
Episode 29
The Wand
Episode 30
The Ape
Episode 31
The Car
Episode 32
The Curse
TheMicrowaveSeason1nav TheMeddlerSeason1 TheHelmetSeason1 TheFightSeason1
Episode 33
The Microwave
Episode 34
The Meddler
Episode 35
The Helmet
Episode 36
The Fight

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