The episode starts with Gumball, Darwin, and Ocho having overslept and rushing off to school. Gumball and Darwin arrive at school to find Ocho beat them, causing Gumball to ask how he got to there before they did. Ocho explains that his Uncle Mario drove him to school which, after some clarification, causes Gumball to deduce that his uncle is the famous Mario and demands that Ocho marries him. After some deliberation, Gumball finally concludes that he wants to be Ocho's best friend. Darwin tries to explain how terrible of an idea it would be to manipulate Ocho, but Gumball refuses to listen. Ocho then reappears to test Gumball's trust, taking him to the school gym for a fight.
In the gym, Ocho gets involved in a fight with Bomb Guy, Rotten Cupcake, and Rat. Gumball is forced to take care of Rotten Cupcake and initially attempts to forge a compromise where he pretends to go down, but the plan fails when Rotten Cupcake instead proceeds to beat up Gumball. However, by accident, Gumball knocks him into an exercise pulley, causing the weights to fall on Rotten Cupcake and mash his face in. Gumball then plays it off as deliberate to impress Ocho.
Later, at the library, Ocho tests Gumball's ability to keep a secret by revealing his real name: Harry Tootmorsel, an Old Flemish name meaning "Hot wind from the south." Gumball tries to withhold laughter, eventually causing his eyeballs to pop out. Gumball then asks if Ocho has any more secrets, so Ocho confesses that he uses his childhood blanket as a gag when he takes people's pets hostage.
In the school hallway, Darwin argues against Gumball lending $100 to appease Ocho. After some arguing, Gumball reveals that he got it off of Richard and Nicole's credit card. Meanwhile, at the store, due to Gumball having removed the card's funds, Richard is unable to spend $1 at the grocert store. Larry tells Richard to sign up for a store credit card scheme, which he does, but the interest scheme puts Richard $121,248 (doubling by the second).
On the way home from school, Gumball is kidnapped and forced to either risk his life or Ocho's - either he jumps off of a ledge to spare Ocho or refuses and spares himself. After a botched attempt at stalling, Gumball eventually jumps, after which it is revealed that the kidnapping was a prank set up by Ocho as another part of his test. Gumball is traumatized but attempts to hide it.
As a final test, Ocho brings Gumball back to the gym and into the 'circle of trust,' presenting him with one last task- Gumball must sacrifice Darwin, giving Gumball a hammer to finish the job. Gumball ultimately hangs up pictures around the school denouncing their friendship as an alternative to presumed murder. Darwin is hurt, but through song, the two acknowledge that the declaration doesn't mean anything.
Gumball then runs off to play golf with Ocho and Uncle Mario, but upon arriving, is bummed to find that he was not the real Mario that Gumball set out to see. Darwin tries to cheer Gumball up and the two try to figure out how to terminate the relationship. Gumball ultimately settles on song, singing of how terrible their friendship was and of the measures he was willing to take to keep Ocho as far from him as possible (for Gumball's own safety). Afterwards, Ocho apologizes, having realized that he went too far because of his trust issues stemming from having another, more famous uncle in the form of "the blue hedgehog who can run really fast." Darwin tries to stop Gumball from going after Ocho again, but he runs off after Ocho regardless, ending the episode and presumably repeating the cycle.
Several references to the Mario video game franchise can be found in this episode:
Gumball asks if Ocho's uncle drove him to school in a kart, a reference to Mario Kart, and laughs when Ocho replies that his uncle has a plumbing business as Mario is typically portrayed as a plumber. Gumball then asks if he is scared by ghosts, and if he likes stars, dinosaurs, and princesses, all of which are recurring enemies, items and characters in the franchise.
Gumball says "Yahoo!" and "Let's-a go!" in an accent and intonation similar to Mario's. Additionally, he starts singing a song which resembles the Super Star invincibility theme, then mimics actions and sound effects from a typical level of Mario such as jumping on people's heads, going down a pipe, and sliding down a flag pole.
Uncle Mario wears an outfit that is very similar to Mario's outfit.
Uncle Mario's deadpan declaration of, "Hey, it's me, Mario," is based off of the character's trademark "It's a-me, Mario!"
The episode's title and premise may be a subtle reference to the line "My uncle works for Nintendo," which has been used for decades by people who wanted to spread false information about Nintendo games.
The scene in which Ocho pretends to kidnap Gumball and potentially kill him or Ocho may potentially be a reference to a prank done by YouTube personality, Sam Pepper, in which he did a similar prank with another person tricking the latter's friend into thinking he was going to die after "kidnapping" him.
The posters announcing that Gumball and Darwin are no longer best friends are a reference to a similar Facebook post which quickly turned into an Internet meme.
When Ocho says he has an uncle who is a blue hedgehog and can run very fast, Gumball thinks of Sonic the Hedgehog. The way he runs back to Ocho at the end of the episode is also similar to Sonic's run.
When Gumball got off the bus, he was whistling the Kanto Route 1 theme from Pokémon.
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[Episode starts with Ocho running and panting. Gumball and Darwin suddenly walk by him in a hurry as well.]
Ocho: You're late too?!
Gumball: Yeah, the alarm clock went back to sleep mode, and I didn't have the heart to wake it up. You?
Ocho: My alarm clock didn't dare to wake me up not after what I did to the last one!
[Gumball and Darwin leave because the situation became uncomfortable.]
Gumball: Right, uh, well, see you at school!
[School bell rings.]
[Gumball and Darwin reach the school (barely) but are surprised to see Ocho there first.]
Gumball: [Gasps] How did you get here first?!?
Ocho: Yeah, my Uncle Mario gave me a lift.
Gumball: [Laughs] What, in his go kart?
Ocho: Nah, he only races at the weekend. During the week, he's too busy with his plumbing business.
Gumball: Wait, is he scared of ghosts, by any chance?
Gumball: And he likes stars, dinosaurs, and princesses?
Gumball: ...and he's your uncle?
Ocho: Yeah. So?
[Gumball inhales deeply]
Gumball: Marry me!
[Teri and Masami walk by, implying that they made a bet whether or not Gumball would ask Ocho to marry him.]
Teri: Called it.
Masami: Guess I owe you 20 bucks.
[Camera zooms back on Ocho and Gumball.]
Gumball: No, okay, I get it. I'm moving too fast. I meant adopt me.
Gumball: Date! Uh, should we d-date first?
Ocho: You mean you want to be friends?
Gumball: Best friends!
Ocho: Uh, okay...
[Ocho walks away, and the camera zooms into Gumball.]
Gumball: The rest will follow naturally.
Darwin: Gumball, it's a bad idea to manipulate someone's feelings for your own gain. Especially if that someone's Ocho.
Gumball: Yeah, I get your point, but on the other hand... Mario!
Darwin: Let's just take a moment to remember what Ocho's like when he's angry.
[Gumball and Darwin start to ponder;Tobias is seen walking down the school hallway and accidentally bumps into Ocho. Suspenseful music starts to play as Ocho chases Tobias. Tobias reaches a stop and Ocho goes near him and the imagination ends]
Gumball: Eh, he's not that bad if you think about it with different music.
[Gumball and Darwin start to imagine the same scene again but with a much nicer music]
Darwin: You'll regret this.
Gumball: Yeah, but my tombstone will say, "This dude met Mario."
Ocho: Follow me! I need to test you before you can enter my circle of trust.
Gumball: Okay, where do we start?
Ocho: I need to see if you've got my back in a fight.
[Gumball starts getting nervous and exchanges glances with Darwin. Gumball and Ocho are now seen in the school gym with the bullies]
Bomb Guy: I'm gonna punch you so hard, you're gonna beg for your baby teeth back!
Ocho: Yeah? Well, I'm gonna punch you so hard, it'll make the Big Bang seem like the Little Pop!
Gumball: How did this situation escalate so quickly? I was literally two steps behind you!
Bomb Guy: [Groans] Get them!
[Ocho then fights Bomb Guy and Rat, while Rotten Cupcake goes up to Gumball and growls at him]
Gumball: Okay, don't worry, I'm not gonna hurt you. I'm just gonna take a swing, and you just go "Aah!" and take a fall and we're good, all right? [Rotten Cupcake kicks Gumball in the groin and he falls to the ground in pain] Okay, great. You're right. It looks better if you put up more of a fight. So next, I-[Rotten Cupcake proceeds to beat up Gumball by putting a trashcan over his head and continuously swinging a broom at him] So now I'm gonna pretend to kick, you dodge, and then pretend to fall on a right hook. [Gumball starts kicking and going towards Rotten Cupcake. Rotten Cupcake takes steps back but trips and lands on the lat pulldown machine and gets decapitated with the weight]
[Gumball takes the trashcan off his head and looks at Rotten Cupcake, then Ocho comes near him]
Gumball: Uh, yeah! That-That's what you get!
Ocho: Very good, but we're not done yet.
Gumball: [Whispers to Rotten Cupcake] Good job. You really sold it.
Rotten Cupcake: [Groaning with pain and pink liquid drips out of him] Please call an ambulance.
Gumball: Okay, now you're just being hammy. [Walks away]
[Gumball and Ocho are now seen in the library]
Ocho: Now I need to test if you keep a secret. Ocho isn't my real name. [writes down on a sheet of paper his real name and hands it to Gumball]This is my real name.
Gumball: Harry Tootmorsel. [stifled laugh]
Ocho: Real friends don't laugh at each other's misfortune.
Gumball: [exhales slowly] Of course, Tootmorsel. Is it Nordic?
Ocho: Old Flemish, actually. It means "the hot wind from the south." It's a family name that's been passed down the generations. My grandfather passed it. My father passed it. One day, I will pass it. [Gumball continuously holds his laugh in until his eyeballs pop out]
Gumball: Cool secret. Anything else?
Ocho: I still sleep with the blanket I had as a baby.
Ocho: I use it as a gag when I take people's pets hostage.
[Ocho and Gumball glance at each other for a second]
Gumball: Uh huh. [Ocho keeps staring at Gumball] There's no punch line 'cause it's not a joke, is it? [whimpers]
[School bell rings. Gumball and Darwin are seen by the lockers]
Darwin: Why did you agree to lend Ocho $100?!
Gumball: Because it was another one of his tests.
Darwin: That's not a valid reason.
Gumball: [scoffs and rolls eyes] Because Mario.
Darwin: That's even worse! Anyway, where'd you get the money from? Even mom and dad don't have $100.
Gumball: Not anymore they don't, [holds out a $100 bill and Ocho snatches it. Darwin shakes his head] but, that's what credit cards are for, right? What's the worst that could happen?
[Scene cuts to Elmore shoppin;Richard is at the cashier with Larry]
Larry: ...so one-hundred expired doughnuts comes down to $1.
Richard: Bargain! [takes out his wallet] Oh, better put it on the credit card.
Larry: [slides the card but comes out declined] The card's been declined, sir.
Larry: I'm afraid I'm gonna have to cut it up.
Richard: [groans] This couldn't get any worse.
Larry: But, we do have our own store credit-card scheme that lets you borrow as much as you like with interest, of course.
Richard: Fine! [signs sheet of paper]
Larry Thank you. [slides card] According to our interest scheme, you now owe us $7,578.
Richard: This really couldn't get any worse.
Larry: Unfortunately, the interest rate doubles every second, so you now owe us $15,156.
Richard: [falls to the ground] It really, really couldn't get any worse. [starts crying]
Larry: $30,312, $60,624...
Richard: Touché, universe. Touché.
[Scene cuts to Gumball getting out of the school bus and walking along until someone puts a bag over his head and kidnaps him]
Gumball: Aah! [grunting] What is this?! What is going on?!
Ocho: [deep voice] You took my best friend from me!
Gumball: Who are you? What do you want?!
Ocho: You took Ocho from me! Now you're gonna have to make a choice.
Gumball: What?! What do you mean?!
[Gumball is seen standing on the edge of a cliff with the bag still over his head]
Ocho: Choose between yourself and Ocho. One of you has to go. Option "A" Jump, and I spare him. Option "B" Don't jump, and he goes down. So what's your answer?
Ocho: "Yes," what?
Gumball: [Mumbles indistinctly]
Gumball: [keeps mumbling]
Ocho: Hold on, let me get closer. I can't hear a word of what you're saying.
Gumball: Ha! You fell into my trap! [punches in the air]
Ocho: I'm on the other side.
Ocho: Fine. You made your choice.
Ocho: Make your decision! It's him or you! You're running out of time! Choose now!
Gumball: [jumps] Aah! [lands on the floor] Huh?
Ocho: Good choice.
[Gumball takes off the bag from his head, only to find out Ocho set the whole thing up at the skatepark]
Ocho: A true friend always puts the other before himself. [normal voice] Also, funny prank, right?
[Gumball starts having traumatizing flashbacks]
Gumball: Yeah. You really got me there. [whimpers]
The Circle of Trust
[Scene cuts to the gym]
Gumball: Um, what's this?
Ocho: The circle of trust. To complete the ritual, you must forsake all other friends and declare your loyalty to me alone.
Gumball: What do you mean?
Ocho: [drops a hammer by Gumball] You must sacrifice Darwin.
[Gumball looks horrified and suspenseful music plays. Gumball creeps up behind Darwin slowly with the hammer, but uses it instead to post up pictures of him and Ocho around the school. Darwin looks displeased and reads what the picture says]
Darwin: "Darwin is no longer my best friend. Best friendship is begun with Ocho"? Uh, ouch.
Gumball: Trust me. It's way better than what he suggested I use this for. And this was the final hoop I had to jump through to be friends with that nut case.
You know you'll always be my bae.
Darwin: And you'll always be my boo
Gumball and Darwin: Your friendship gets me through the trials of the day and through the darkness of the evening too.
Darwin: All right, then, so when do you get to see Mario?
Gumball: Apparently, he's taking me and Ocho for golf! I mean, that's probably the most boring game you can play with Mario, but still. Yahoo! [School bell rings] Let's a go!
[Gumball starts running across town pixelated and bumping into various citizens. He takes Crocodile Woman's hat and throws it at William, then goes under the sewer. He then comes back up and jumps over Susan, then jumps over garbage bins and slides down a flag pole]
Gumball: [To Ocho] Hey, man!
Ocho: Oh, hey, dude. This is my uncle. [A humanoid turns around to Ocho and Gumball]
Mario: Hey, it's me, Mario.
Gumball: Uh.. [Frowns]
This Friendship is Over!
[Scene changes to the Wattersons' house, where Gumball is brushing his eyes with a toothbrush in the bathroom]
Darwin: You must be really disappointed it wasn't the real Mario. Still makes sense. I mean, any guy would like go-karting, stars, and princesses.
Gumball: I think I'm more upset about the amount of butt he flashed every time he picked up the ball. [Spits with his eyes] It looked like a huge purple apricot stuffed into a cheap pair of polyester pants.
Darwin: So what now?
Gumball: I refuse to hang out with a kid whose own parents have to lock their bedroom door to feel safe at night.
Darwin: Uh, how do you let someone that dangerous down?
Gumball: Off the edge of a cliff.
Darwin: You mean that metaphorically, right?
Gumball: Yeah, o-of course.
Darwin: How are you gonna break it to him?
Gumball: A strongly worded letter. [Darwin glares at him] A mildly worded poem? [Darwin shakes his head. Gumball sighs]
[Slow music starts playing]
Gumball: I wanna say you're a real good guy
But we both know that would be a lie
It's been a nightmare being your friend
So it's time for this charade to end
I can't say goodbye
'Cause you might grind me down into meat pie
I'll tell the school that you've got avian flu
So it'll be their job to get rid of you
I hope they put you into quarantine
Or lock you up until you turn eighteen
So maybe then I'll never have to fear
That you might suddenly bite off my ear
Please don't bite off my ear
I can't say goodbye
My face will be too mangled to identify
If I could get your house repossessed
You'll be forced to relocate to your gran's in the Northwest
I could get you arrested for stealing a car
I could get you a job as a miner
I could ship you in a crate to Qatar
Or sell you as kebab to a dirty diner
It's not real meat, anyway
I could get your folks to forget you on the freeway
Sell you to a freak show on its way to Uruguay
I could get you stuck on a fairground ride, forever
Send you to a wedding in Somewhere-stan with you as the bride
I can't say goodbye
But it's no use trying to deny
That I don't wanna be friends with you
So do whatever you have to do
[Ocho and Gumball are in the schoolyard]
Ocho: [sighs] I get it. Too intense, right?
Gumball: If I had to rate my stress on a scale of one to ten, I'd score a- [Gumball lifts his hand up all the way to the sky which goes through a plane causing passengers to scream]
Ocho: I'm sorry, I shouldn't have tested you like that. It's just I got trust issues. I always wonder if people really want to be friends with me, or, you know, because of my uncle being so famous and stuff.
Gumball: What? Mario?
Ocho: No, the other one. [whispers] The blue hedgehog who can run very fast. But it's cool. After all we've been through. I think I'm more able to trust people now, so thanks for that. [walks away]
Darwin: [Darwin walks by] Not worth it.
Gumball: [groans] You're right. [walks away]
[Gumball then runs very fast referencing Sonic the Hedgehog ending the episode]