The episode starts off with Gumball trying to lick his elbow. Darwin is seen with with a black eye and a chipped tooth, claiming it is impossible to do. As Gumball tells him off, he runs into a locker door, giving him a black eye and chipping his tooth. Mr. Corneille is then seen entering the nurse's office, also with a black eye and chipped tooth. Gumball and Darwin enter and ask him what happened to his face. Mr. Corneille says he hurt it after he walked into "the cage." Gumball misunderstands, assuming Mr. Corneille is an MMMMA fighter. Mr. Corneille tries to correct Gumball, but stops when he sees Joan is impressed with him. Gumball soon demands Mr. Corneille to teach he and Darwin how to be MMMMA fighters.
In the gym, Mr. Corneille explains to the boys that the MMMMA fighters love what they do, and that their fighting is another form of love. Gumball and Darwin then perform an awkward fight, with moves that seemingly are fighting moves, but then devolve into compassionate ones. Principal Brown enters the gym, informing the boys and Mr. Corneille that the school has suffered from some budget cuts, with the board agreeing to rent out half the school to a prison. He quickly leaves when the alarms that indicate an escaped inmate go off.
While walking through town, the boys encounter a flyer that keeps coming back to Gumball. Darwin suggests it may be fate giving them an answer to the school's budget issue. The flyer is revealed to be a body waxing ad. Darwin then points out that he was referring to a billboard advertising an MMMMA challenger fight. Gumball and Darwin then go back to Mr. Corneille, asking him to participate in the challenger fight. Mr. Corneille declines at first, but Joan manages to convince him to join.
At the conference, Mr. Corneille weighs himself, followed by his opponent, who is so heavy he crushes the scale. Later, Melted Cheese Guy introduces Joao, "The Grave," Diga, and Mr. Corneille, going under the title of "The Amphi-Barbarian" after a small dispute between Gumball and Darwin. Joao believes Mr. Corneille to be a joke, proceeding to politely insult him. Gumball takes it a step further, insulting Joao's personal life. Offended, Joao promises to end Mr. Corneille.
At the park, Gumball and Darwin show their concern for Mr. Corneille, to the point of showing him video footage to prove how dangerous Joao is. Mr. Corneille assures the boys that he is going to let Joao wear himself down with training, while he relaxes. The scene after shows him taking a rest and sitting down while Gumball and Darwin watch him. Eventually, Mr. Corneille stretches, only to break his back.
Mr. Corneille is shown being massaged by Joan. Gumball expresses his concern, telling Mr. Corneille that he cannot fight in his current condition. Mr. Corneille insists that he can fight Joao, and asks Gumball and Darwin to just believe in him. They say that they will, but in the next scene Gumball is on the phone with Joao's manager to pull Mr. Corneille out of the fight. After Gumball denies several deals and suffers having coffee spit on him via the phone, he and Joao's manager agree on Joao going easy on Mr. Corneille in order to save Elmore Junior High. Mr. Corneille is shown to have heard the entire conversation. Gumball and Darwin once again try to tell him he cannot fight Joao. Mr. Corneille suddeny punches a straight, circular hole in the wall and tells Gumball and Darwin not to come to the fight. As the boys stare through the hole, they both regain hope that Mr. Corneille can actually win.
At the fateful event, Mr. Corneille prepares to fight Joao. As he enters the stadium, Gumball, Darwin, and Joan are waiting for him. After hugging Gumball and Darwin and kissing Joan, Mr. Corneille enters the cage. Mr. Corneille then admits to Gumball and Darwin that he lied about being an MMMMA fighter, and that by "the cage" he meant he walked into the hamster cage, and that it happened due to him trying to lick his elbow. Gumball tells him to get out of the ring, but Mr. Corneille refuses, dead-set on fighting Joao. No sooner does the fight begin, it abruptly ends when Joao smashes Mr. Corneille. Everyone in the stadium stares in both shock and silence. Gumball mentions that at least they got the money to save the school, and the episode ends.
[The episode starts with Gumball and Darwin walking through the Elmore Junior High corridor. Darwin has a chipped tooth and a black eye, while Gumball is trying to lick his elbow.]
Darwin: [Lisping] I'm telling you, it's impossible. I tried and this is what happened.
Gumball: That can't possibly explain how you can chip a tooth while trying to lick your elbow. [Smashes into an opened locker door, giving him a black eye and a chipped tooth just like Darwin's] Ah.
[The scene switches to the nurse's office as Mr. Corneille. Joan sees Mr. Corneille has a black eye and a chipped tooth]
Joan: [Gasps] Mr. Corneille, your face! What happened?
Moonchild Corneille: Pretty momma, handsome daddy. [Clicks tongue and points his thumbs towards his face]
Joan: No, I meant your black eye.
Moonchild Corneille: Hah, you should see the other guys. [Points backwards as Gumball and Darwin enters the nurse's office]
Gumball and Darwin: Hi, Mr. Corneille.
Moonchild Corneille: [Nervously laughs] I cannot stress strongly enough, these are not the other guys.
Gumball: What happened to your face?
Moonchild Corneille: Oh, I just walked into the cage and got hurt.
Gumball: What? You got into the cage, like, you’re an MMMMA fighter?
[Mr. Corneille tries to explain further but Joan cuts him by reacting romantically.]
Darwin: What is that?
Gumball: Meaty Men Misunderstanding Martial Arts.
Darwin: Sounds kinda violent.
Gumball: [Blows raspberry] Only according to the so-called “medical community.”
Joan: [Romantic voice] Oh, Mr. Corneille, who knew you’d be so- [Squeezes Mr. Corneille's arm, returns to normal voice] oh, that arm feels a lot more withered than I thought it was gonna be.
Moonchild Corneille: Well when you're fighting in the cage, the most important muscle is the heart. And right now, you’re giving mine a workout.
[As Joan and Mr. Corneille giggle and blush, Gumball, with tears and snot on his face, rises up behind them]
Gumball: [Whispers] Teach us.
Moonchild Corneille: Uh, I-I don’t know, I-
[Gumball's head abruptly grows big, knocking down Joan, Darwin, and Mr. Corneille]
Gumball: TEACH US!
[Transition to the gym]
Moonchild Corneille: The men who step into the cage love what they do. And by stepping into it, you're saying to your opponent, "I love you. And I'm gonna punch you in the body with my body with so much love that you pass out."
Gumball: What? I thought you were gonna teach us how to become tough fighter guys.
Moonchild Corneille: But if you rearrange the letters of "tough fighter guy," you get "tighter of hug guy." Coincidence? Yes, but a useful one. Come, let's get started.
[Gumball and Darwin try to perform mildly violent moves but instead keep performing friendly ones. While Darwin is rubbing Gumball's chin, causing him to purr, Principal Brown shows up]
Nigel Brown: I'm uh, sorry to interrupt whatever that is but I'm afraid I have some bad news. There have been some budget cuts and the school board has agreed to rent out half the school to another "institution." So, I'm afraid you have to leave.
Gumball: Surely, there is a better solution.
Nigel Brown: This is our last resort. We've already cut everything we can from the budget. Look, [points backwards] those aren't even real fire extinguishers. They're just canisters of dippy string. If a fire starts in this school, things are gonna get very dippy... Also pretty tragic.
Darwin: So, you're just gonna privatize the school like some kind of prison?
Nigel Brown: Funny you should say that- [An alarm goes off] Oh-ho-ho, don't worry. Just means one of your new "classmates" has escaped. We'll know if everything really bad happens because the big siren will go- [Another alarm goes off. Gumball and Darwin begin to feel uneasy. Principal Brown is seen leaving the gym]
MMMMA Challenger Fight
[Gumball and Darwin are shown walking through town]
Gumball: What's happened to our school is a disaster. The forced exercise, the communal showers, the canteen slop, the unpaid work, the abuse of power. And if that wasn't enough, now with the prisoners it's gonna be overcrowded too!
Darwin: There must be a solution.
[A flyer hits Gumball in the face. He throws it aside, but it hits his face again. In frustration, Gumball crumples the flyer into a ball and kicks it upwards. The flyer unravels and hits Gumball once again. When Gumball is about to tear it to pieces, Darwin stops him]
Darwin: Wait, maybe that poster's fate hitting us right in the face with the answer to our problem.
[Gumball looks at the flyer, which depicts a woman, in tears, running away from another woman]
Gumball: Hair Force Gone. Full body waxing. Tell us when to stop, we won't listen.
Darwin: No, I meant that one. [Points at the billboard]
Gumball: [Gasps] An MMMMA Challenger Fight!
[Cut to school corridor near the nurse's office, Gumball and Darwin both stare at Mr. Corneille excitedly]
Moonchild Corneille: [Casually laughs] I'm sorry, but I don't fight for money. Violence is never the best solution.
Gumball: What about the nurse? She wouldn't even have a job if people didn't get hurt.
Joan: [Steps into the hallway] My alibi is watertight. Unlike that boat the previous nurse was in. [Short pause] I mean... [Takes Mr. Corneille's hands, making him blush] Mr. Corneille, surely you'll fight if it means saving the school.
Moonchild Corneille: But to go back into the cage, I'm gonna need a whole support team. Even a medic.
[Gumball pops up behind Mr. Corneille]
Gumball: I'll bet you will.
Moonchild Corneille: [Kicks Gumball away] I meant someone qualified, someone who knows how to use a scalpel and no, that doesn't mean you either, Frank the Butcher.
[Frank is shown standing nearby, sighs, and then walks away]
Moonchild Corneille: So what do you say, Ms. Markham?
Joan: [Removes her cap, making her hair unravel] Please Mr. Corneille, let's lose the formalities. My name is Joan.
Moonchild Corneille: Mine is Moonchild.
Joan: I'll stick with Corneille.
Moonchild Corneille: Fair enough.
[Gumball pops up behind Mr. Corneille again]
Gumball: So, you'll fight then?
Moonchild Corneille: Absolutely.
Mr. Corneille Joins the Fight
[The scene crossfades to a press conference]
Melted Cheese Guy: Time for the weigh-in.
[Mr. Corneille steps onto a scale. His weight is barely ten pounds. After that, a rumbling sound is heard. Mr. Corneille looks at his opponent with an intimidated look. The opponent's fist-like feet step onto the scale, which breaks under his girth. The camera pans back to reveal this opponent's head and hands are fists as well. The opponent growls at Mr. Corneille. A flash transitions to Melted Cheese Guy introducing the two fighters.]
Melted Cheese Guy: On my right, we have the reigning champion, Joao, "the grave," Diga!
[Joao is shown to Melted Cheese Guy's right, with Gumball and Darwin sitting opposite Melted Cheese Guy. Joao slams down into his seat, making the crowd stop cheering]
Melted Cheese Guy: And on my left, we have the challenger... [Whispers to Gumball] What's his name, kid?
Gumball: [Whispers to Darwin] Quick! We need a name.
Darwin: Oh, oh, I got it, The Frog Prince.
Gumball: Sounds like he's gonna get kissed, by a fist.
Darwin: The Croaker.
Gumball: That's like he all he does, is croak.
Darwin: The Frogspawn.
Gumball: Nah, that's just gross.
Darwin: Colonel Jazzhand, The Germinate Crawler.
Darwin: The Birthday Boy. [Gumball shakes his head] The Summertime Man. Wait, I've got it! Look out, it's Christmas Person.
Gumball: Are you having a brain cramp?
Darwin: Why don't you do better then?
Gumball: [Whispers to Melted Cheese Guy] The Amphi-Barbarian.
Melted Cheese Guy: The Amphi-Barbarian!
Darwin: Nah, that's better.
[A small amount of people in the audience are heard clapping as Mr. Corneille shows up and sits down casually.]
Someone at the Audience: Where's the rest of him?
Mike: He looks like one of those before-and-after ads but before the gym and after a disease.
Gumball: You don't have to take that.
Joao: This man is a joke! [Slams table and stands up] You want a joke!? When I finish with you, they'll have to send your teeth to you in the mail. Because the teeth will have landed far away and the postal service is the most practical way for you to retrieve them and avoid the necessity of going there on foot.
Gumball: Oh! Oh! Trash talking time! [Clears throat] Oh yeah? Well I heard you train twenty-four seven, which I guess you have the freedom to do when you have any meaningful relationships! Whaa?? [Joao slams the table in anger. Melted Cheese Guy ducks below the table.] Heh. Being so rich and successful, it must be difficult to know whether your friends like you for your fame or for your lack of personality. [Joao growls loudly. Gumball then stands right in front of Joao's face] You know what's really loud, Joao? Insecurity. Confidence is silent, [Whispers] just like your empty mansion. [Joao growls in anger. Melted Cheese Guy separates him and Gumball]
Melted Cheese Guy: Gentlemen, please! Save it for the fight.
Joao: Before this, I was just gonna bake you. But now, I am going to end you!
[Audience cheers again]
Art of Training
[Gumball, Darwin, and Mr. Corneille are at at the park. Mr. Corneille is meditating]
Darwin: Mr. Corneille, aren't you little concerned what Joao said?
Gumball: Yeah, shouldn't you be like, training instead of mediating? Wait a minute. [Hears Mr. Corneille snoring] Ugh, [Moves Mr. Corneille's arm, waking him up] come on! How can you sleep when your opponent is capable of this? [Gumball grabs his phone and shows Mr. Corneille a video of Joao punching a battleship, causing it to immediately sink] That was a friendly match against the U.S. Navy. The week after that, he was scheduled to fight Belgium.
Darwin: Fight who in Belgium?
Gumball: The whole country. But they forfeited when they saw what he did to the ship.
Moonchild Corneille: Kids, you need to relax. I have a plan. Let that guy wear himself out with the grueling training schedule while I save my energy. I call it the art of training, without training. Cue montage.
[Cut to Mr. Corneille's office. Mr. Corneille is sitting with his feet on the table while Gumball and Darwin watch him "training". "Take a Rest, Sit Down" plays through the entire scene]
Voice: Take a rest, sit down
Let the other guy do the runnin' round
Take a rest, lie down
Ditch the track suit for a dressin' gown
Try to relax, don't tire yourself out
Avoid any form of training
Like seriously, dude, workin' hard at stuff
Is dumb and super draining
Ba-da ditty, I'm just filling time
I'm not even gonna make it rhyme
But, oh, my goodness, that bit rhymed accidentally
Well, here's the chorus again
Take a rest, sit down
[Sighs] Somethin' about runnin'
Take a... [Yawns]
[Mr. Corneille tries to stretch, but his back breaks]
Moonchild Corneille: [In agony] Ahh! Medic!
[Scene turns black.]
Pulling Mr. Corneille Out of the Fight
[We see the Elmore Junior High, now outfitted with barbed wires, window barriers, a chain-like entrance, and security cameras. Inside the nurse's office, Gumball and Darwin watch Joan massage Mr. Corneille]
Gumball: I'm sorry, but as your trainer, I must tell you that you cannot fight in this condition.
Moonchild Corneille: It's just a crick in the neck.
Gumball: No, I meant you're really physically underdeveloped. Which is a polite way to say that I've seen stronger limbs on discarded Christmas trees in March, and that you're gonna get your butt handed to you. In an urn.
Moonchild Corneille: Ey, don't worry, kids. I've studied video footage of Joao. He has a telltale sign just before he hits.
Darwin: What is it?
Moonchild Corneille: He curls his fingers into a fist [Balls his hand up], and raises his arm. [Raises his own arm] Ahh, come on kids, lighten up. Ninety percent of the fight is one of the mind. All you need to do is believe in me. Can you do that?
[Gumball and Darwin sigh]
[The scene abruptly changes to Gumball calling Joao's manager.]
Gumball: Hey, is this Joao's Manager? Yeah, this is Corneille's team, we wanna pull out of the fight.
Joao's Manager: [Spits coffee through phone, splattering it all over Gumball and Darwin] WHAT!?
Gumball: We're forfeiting.
Joao's Manager: [Spits coffee through phone again] You can't do that on the day of fight! Okay, I can give you an extra ten-thousand.
Gumball: Yep- nah, we just wanna pull out.
[Gumball tries to protect his face from the coffee. He lowers his arm when no coffee comes through the phone, but as soon as he does, Joao's manager spits coffee again]
Joao's Manager: Sorry, I had to make another pause. Listen, this is my last offer. Your guy goes down in the first round, and we split the ticket sales.
Gumball: [Sighs] It's not about the money, we just don't want him to get hurt.
Joao's Manager: [Spits coffee] Fine! Seventy percent for you, thirty percent for me!
Gumball: Okay, [Wipes off coffee on his face] I think you're drinking too much coffee, sir. It's bad for your health.
Joao's Manager: [Spits coffee] Too much coffee is bad for your health! Listen, I promise you, I will go easy on your guy. Then we can save your school. Do we have a deal?
Gumball: O-oka- [Gets cut off by Joao's manager spitting coffee again] OH COME ON, MAN!
Joao's Manager: Sorry, I just really didn't expect you go with that last deal.
[Gumball hangs up the phone. He and Darwin then notice Mr. Corneille is behind them and heard the entire conversation]
Moonchild Corneille: So, it's like that, huh?
[Mr. Corneille sadly walks away. Gumball and Darwin shake their heads to get rid of the coffee, and follow Mr. Corneille]
Darwin: Look, sir, it's not that we don't believe in you...
Gumball: It's that we know you can't win.
Moonchild Corneille: Of course, I can!
Gumball: How!? Show us. How on Earth are you gonna hit this guy?
Moonchild Corneille: With my heart! LIKE THIS! [Punches the wall, leaving a hole in it. Gumball and Darwin stare in shock] Just leave me to it. And don't bother coming. [Walks away]
[Gumball and Darwin look through the hole in the wall. They both smile at each other, now believing Mr. Corneille actually can win the fight]
[At the stadium, Joao stands inside the ring as the onlooking audience cheers. Inside the locker room, Mr. Corneille is sitting on a bench, wearing a purple robe. Someone opens the door.]
Announcer: It's time.
[Mr. Corneille walks to the fighting ring, taking deep breaths. He sees Gumball, Darwin and Joan near the cage. Mr. Corneille hugs Gumball and Darwin.]
Gumball: [Holds Mr. Corneille's head] Win. We believe in you.
[Mr. Corneille sheds a tear. He approaches Joan and holds her hands.]
Joan: Look, Mr. Corneille, I- [Mr. Corneille kisses Joan] Go get him.
[Mr. Corneille enters the ring and removes his robe. He approaches Gumball and Darwin near the cage.]
Moonchild Corneille: Kids, thank you in believing in me when I didn't even believe in myself. And the reason I didn't believe in myself was because I knew I was lying all along.
[Gumball and Darwin are surprised by this revelation]
Gumball: Wait, what?
Moonchild Corneille: I'm not a fighter, I just lied because I wanted to smooch the nurse. Winks
Darwin: But your black eye? You said you got hurt in the cage?
Moonchild Corneille: When I said I walked into the cage, I meant I walked into the hamster cage... [Gumball and Darwin stare at him in surprise. Mr. Corneille points to his elbow] I was trying to lick my elbow after hearing it was impossible.
Darwin: You lied?
Moonchild Corneille: Lies are only facts, that haven't happened.
Gumball: Are you insane!? Get out of the ring!
Moonchild Corneille: No! I may not have been a fighter when I started but I am now. Thanks to your belief, you saw what I did to that wall. I got this!
[Joan and Principal Brown appear. Inside the ring, Mr. Corneille and Joao looks sharply at each other. Melted Cheese Guy backs them up a bit.]
Melted Cheese Guy: Ready?
Nigel Brown: Was he talking about that wall the inmates dug a hole through?
Melted Cheese Guy: Fight!
[Joao raises his arm, and smashes Mr. Corneille. Everyone stares in both silence and shock as Mr. Corneille lets out a muffled, pained groan. An ambulance can be heard in the distance]
Gumball: Well on the plus side, we still get the money to save the school.