Gumball: I think cheese is better than cake, because you can have cheesecake, but you can't have cake-cheese!
Banana Joe: Urgh, what is it?
Tobias: I don't know!
Leslie: Ah, it smells like manure!
Alan: It looks like a rancid burrito!
Gumball: I think it just moved!
Penny: Somebody do something!
Miss Simian: What is going on here? What are you poking...? Euugghh! It looks like a wet diaper!
Miss Simian: Nigel!
Students: IT'S PRINCIPAL BROWN!
Miss Simian: Oh, my sweet Nigel. Who would shave you, paint you, wrap you in toilet paper and shut you in Watterson's locker? Who did this?
Miss Simian: WHO DID THIS!? I want everyone in class... NOW!
Miss Simian: I SAID EVERYONE!
Rocky: Eww, what's that? It looks like...
Miss Simian: We know what it looks like!
Miss Simian: I'm taking Principal Brown to the nurse's office!
Principal Brown: Nurse...
Miss Simian: Calm down Nigel... event
Miss Simian: And if the culprit isn't found by the time I get back you're all in detention!
Gumball: So, what do you guys think happened to Principal Brown?
Sussie: Well, I saw him at the end of school, so it must have happened after that. event
Tobias: So, who stayed after school yesterday?
Penny: I was doing cheerleader stuff!
Rocky: I was cleaning late.
Gumball: I had detention.
Darwin: I can't remember. event
Carmen: So you are all suspects.
Banana Joe: Oh, c'mon, it was obviously Gumball!
Tobias: Yeah! Brown was found in his locker.
Gumball: Guys, I didn't do it. But I'm gonna find out who did. And I think I know just how. Whoever did it raise your hand! event OK, whoever didn't do it raise your hand!
Gumball: Aha! So you did it!
Alan: event Dude! I don't have any hands!!
Gumball: Darn, you're good.
Penny: Aren't you supposed to... like... look for clues or something?
Gumball: Hmmm, clues... event Like those paint splatters all over your pompoms!!
Penny: No, wait! I can explain!
Gumball: There's only one explanation, it was a crime of passion.
Penny: What do you mean?
Gumball: You knew Principal Brown put me in detention last night, and overwhelmed by your feelings for me, you confronted him in his office.
Penny: Please, let him go. I love him, Principal Brown!
Principal Brown: He's nothing but a rouge!
Penny: But he's noble and strong and brave and handsome! So handsome... He might the best looking guy on the whole school!
Leslie: Gumball, have you seen your yearbook photo?
Gumball: No interruptions, please.
Principal Brown: We all know how handsome Gumball is, but he's still in detention!
Penny: Then you leave me no choice!
Gumball: It was then that you pompom him unconscious-
Gumball: Shaved off his hair in punishment, covered him in paint to humiliate him, wrapped him in toilet paper to keep him quiet, and stuffed him in my locker as proof of your arranged obsession for me.
Gumball: It was you!
Gumball: But I forgive you because I am madly in love with you too.
Penny: Yeah, well, that's not quite what happened. I finally finished my painting at the cheerleaders, and I went to hang it in the stairwell. I guess it was still wet, and I must have got paint on my pompoms.
Gumball: And did anyone see you supposedly hang this alleged painting in this "so-called" stairwell?
Penny: Yeah. You did.
Gumball: Hey, Penny! I love you!...your painting! your painting. I love your painting.
Gumball: Haha. Oh, yeah.
Alan: So if Penny didn't do it, who did?
Gumball: Hmmm. It must have been...you!
Gumball: I said it was him!
Rocky: Why me?
Gumball: Yesterday, you were wandering around when suddenly, at the age of 27, you've realized your youth was behind you.
Gumball: Then all your hair fell out.
Gumball: When you saw Principal Brown's lustrous hairy coat, you were overcome with jealousy. And acting on impulse, you attacked him. You frantically plucked out all of his hair, dyed it the right color, and used it to cover your balding shame. And planning to mislead any investigation, you painted Principal Brown, wrapped him in toilet paper, and stuffed him into my locker, the perfect crime, saying for one thing!
Gumball: When you stuffed the new hair on your body, there wasn't quite enough, which explains THIS BALD SPOT ON YOUR HAND!
Rocky: Dude, you've got it all wrong. I got this bald spot when I was cleaning yesterday! You see, I spill some really strong chemicals on my hand, and it burnt off the hair! See? event AGHHHHHHHHH!
Gumball: If that's the case, how come I can just pull your hair right off?
Rocky: Agh! Oh! Stop! Ah! No! Agh!
Gumball: Oh, OK then, I guess it wasn't you.
Darwin: Who could it be? All this suspense is making me sweaty.
Gumball: Why don't you just wipe your brow with that toilet paper suspiciously stuck to the bottom of your shoe? event CLUEEEEEE! event I can't believe I'm gonna have to say this buddy, but, IT WAS YOU!
Darwin: Yes! Yes! I did it! I'm a monster! A monster! Just lock me up. I'm a menace to society. event Take me away!
Gumball: I rest my case.
Carmen: But Darwin couldn't have done it!
Leslie: We all saw you on the bus when we went home.
Darwin: Then how'd explain the toilet paper?
Tobias: You've had it on your feet all days, dude, didn't you notice?
Darwin: Don't remember any toilet paper!
Gumball: So it wasn't Penny, it wasn't Rocky, and it wasn't Darwin. Which leaves us with only one suspect. The only person who knew the combination to the locker Principal Brown was founded. You!
Gumball: Oh, heh heh.
Miss Simian: That's all the proof I need. You're coming with me, Watterson!
Gumball: Wait! You're forgeting one bit of crucial evidence!
Miss Simian: And what's that?
Gumball: I'll just...go and get it.
Miss Simian: He's not coming back, is he?
Miss Simian: No homework for the one who catches him!
Gumball: Ahahaha! OW!
Tobias: Quick! Give me something else to throw!
Idaho: What? Aah!
Gumball: Stop throwing stuff at me, I'm innocent!
Gumball: Leave me alone! I'm innocent! I would never hurt Principal Brown!
Principal Brown: I think I'm feeling a little better.
Principal Brown: This is extraordinarily painful. It couldn't possibly get any worse!
Gumball: Bobert? Ah! Don't turn me in! Oh, you've been switched off.
Gumball: Ah! Don't turn me in!
Gumball: Principal Brown was attacked, any everyone thinks it was me!
Bobert: But it wasn't you.
Gumball: Exactly! Wait, how come you believe me?
Bobert: I saw...everything.
Miss Simian: GUMBALL! Get him!
Gumball: STOOOOOOOOOOOOOP! New evidence has come to light! Tell them what happened, dude!
Bobert: I can do better than that. I can play you my memory. First, Penny hung her hideous painting on the wall.
Bobert: Then, Gumball turned up, looking love struck as usual.
Bobert: Next, Darwin walked down the stairs, trailing toilet paper like a nin com poop.
Darwin: What's a nin com poop?
Bobert: Then, Rocky dropped a bottle of chemicals on the floor, looking quite old.
Bobert: Then finally came Principal Brown, who's office door suddenly flew open, making him disoriented and dizzy. He fell down the stairs, rolling himself in Darwin's toilet paper, smashed into Penny's artwork, covering his face in paint, fell back into Rocky's chemicals, burning off his hair, then down more stairs, wrapping himself into even more toilet paper, and finally into Gumball's locker.
Penny: But why didn't you say something before?
Bobert: Well, it was so funny, I blew a fuse. I was like, "Ha. Ha. Ha. Ha." ::event
Gumball: He's done it again.
Penny: So, the true culprit is the person who threw open Principal Brown's door!
Gumball: Exactly. And I know just how to find out. Whoever opened the door, put your hand up. Oh, come on!
Bobert: Why don't I just replay the tape?
Gumball: Stop there! Now forward slowly. Freeze! There. Zoom in 50%. Zoom in 100%. Zoom in another 100%. Enhance video.
Gumball: It was you all along! We're going to tell Principal Brown!
Miss Simian: Tell him what?
Gumball: Well, we just saw on Bobert's memory.
Miss Simian: What memory?
Bobert: Erase memoryyyyyyy. Oh come on. [in slow motion]
Darwin: That's not fair!
Gumball: How do you sleep at night, Miss Simian?
Miss Simian: Like a baby. Ahahahaha!
Principal Brown: Has anyone seen Miss Simian?
Darwin: Don't worry, Miss Simian! We just called an ambulance!
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, Carmen reminds Darwin that he couldn't have done it, because she 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, obstructing justice and 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.
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! All: IT'S PRINCIPAL BROWN!
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.)
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.)
When Miss Simian was holding Principal Brown, he was animated in CGI.