This episode begins in Dinner in Elmore Mall where Gumball and Penny are having a date where they are eating ice cream. Gumball then assumes that he cannot get brain freeze and gets one anyway and Penny having to unfreeze him in the bathroom. When Penny and Gumball walked out of the bathroom, Gumball sees Rob and got nervous and asked if Penny knows about him. He sees Rob enters the Hardware store and get coffee.
Gumball then gets a threatening message from Rob which says that he hates him and will squash him out of his yellow skin and hates his slimy bananary guts, which made Gumball confused since none of those relates to him, the message then say that Banana Joe is his new nemesis. Gumball then tried to think it was a mistake and asked Rob about it, but Rob awkwardly states that the message wasn't for him and stated that Banana Joe is his new nemesis, which hurt Gumball's feelings.
At Gumball's house, Penny tries to console Gumball about Rob's new nemesis relationship, but Gumball refuses to accept the reality. As they spoke, the doorbell was rung and Gumball assumed that it was Rob. Penny refuses to let Gumball meet Rob but Gumball manages to escape. It turns out that Rob wanted to return Gumball's stuff to him, hurting Gumball even further.
The scene cuts to Rob spying on Banana Joe, ready to destroy Banana Joe with a trap: Bricks held by a platform held up by a rope that. But before he could deploy the trap, Gumball appears and distracts him, prompting Rob to cut the brakes on his bicycle. Rob ignores Gumball and cuts the rope holding the trap with his scissors, but only to find no scissors. He realizes that Gumball has somehow took his scissors. The trap fails, but instead of yelling at Gumball, he leaves, disappointing Gumball.
Next, Rob goes to Joyful Burger and orders a burger and have Larry serve it to Banana Joe, telling him that it was from a secret admirer. Rob waits for Banana Joe to eat the burger, but Banana Joe decided to remove the ingredients that he did not like, much to Rob's chagrin. As Rob waited, Gumball appears dressed in a banana suit. He assumes that Rob hated Banana Joe because he was annoying and tried to annoy Rob by mimicking Banana Joe's voice and even sipping on a straw noisily.
Rob completely ignores Gumball as he watches Banana Joe. Gumball then went "full Banana Joe" by doing the Banana Dance, catching Banana Joe's attention and he gives Gumball a letter, leaving without touching the burger at all. Rob gets mad and Gumball was excited, but Rob was mad at Banana Joe and not at Gumball. He leaves, and Gumball eats the burger to cheer him up. Just as Gumball stated that there was nothing wrong with the burger, it explodes.
In Gumball's house, Gumball complained about how many cool people had nemesis. Darwin mentions that he had one, and Penny asks who. It turns out that Darwin's nemesis was a hat. Gumball decides that he should just accept it and time over a new leaf and become friends. He tells Penny his idea, but it turns out that Penny had already suggested it to Gumball and he just didn't listen, much to her annoyance.
At Banana Joe's house, Rob was spying on Banana Joe with a binoculars. Gumball pops up in front of him and startles Rob. Rob asks Gumball why he was here, and Gumball states that he only wanted to help. Rob decided to let Gumball be and continued to watch Banana Joe. Gumball then tells Rob that he had booby-trapped Banana Joe's house, much to Rob's excitement.
He waits for it to go off, and Gumball asks why they were watching Banana Joe's house. Confused, Rob states that it was where Banana Joe lives. Gumball wonders whose house he had booby-trapped, and it turned out to be Tobias's house when Tobias flew past after a bomb exploded. Rob then reveals that he had already set a trap for Banana Joe: He had rigged Banana Joe's front door handle beforehand, so when Banana Joe opens the door to take out the trash, it will unhook the latch of a truck at the back of the street and send oil barrels rolling down to obliterate Banana Joe. Gumball comments on how Rob explained it in a lot of unnecessary detail.
Rob and Gumball watched as Banana Joe opened the door to take out the trash as planned and triggers the trap. But just as Banana Joe was about to step on the sidewalk, Gumball takes out his phone to snap a picture, but accidentally turns on the torch and makes Banana Joe freeze in his place, letting the oil drums pass by Banana Joe completely.
Rob gets angry and he tries to shut off Gumball's phone, but quickly hides when Banana Joe approaches. Banana Joe asks what Gumball was doing behind a bush, and Gumball says that he was just chilling out with Rob. Rob emerges from the bushes, angry. He finally snaps and screams at Gumball in anger, claiming that he hates Gumball, much to Gumball's delight.
At school, Gumball tells Darwin that he just needed to keep the hate interesting. Darwin says that it was a huge commitment and Gumball agrees and said he had also smoothed things over with Penny. He says that he couldn't find any cards that was appropriate for his situation. When Darwin asks what he did, it turns out that he had locked Alan in her locker and wrote "Sorry" on Alan and on all of her books, stating that he could not find any balloons either.
Seeing that Darwin has the hat on he congratulates Darwin on having smooth things over as well. A confused Darwin asked Gumball what he meant by that, and Gumball points it out. The episode ends with Darwin screaming and running away.
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At The Mall
[Episode opens on a shot of the mall. The camera cuts to Dinner, where Gumball and Penny are having ice cream. Gumball is eating his at a high speed.]
Penny: Gumball, slow down, you'll get brain freeze.
Gumball: I'll be fine, it's my special skill. I can eat as much ice cream as I want and never get--
[Scene cuts to the bathroom. Penny is holding Gumball, whose head is frozen in a block of ice, under the fan.]
Gumball: --brain freeze. [Looks around.] Uhh...how'd we get here? [He and Penny leave the bathroom.] So, how about an ice cream?
Penny: [Sighs in annoyance.]
[Camera pans to reveal Rob.]
Gumball: [Gumball hides behind a pay phone.] It's my mortal enemy, Rob! Do you think he saw me? Have I ever told you about Rob?
Penny: Yeah. Once or twice.
[Flashback to Penny's birthday. As Patrick, Mrs. Fitzgerald, and Penny's sister try to sing happy birthday, Gumball is overlapping them while talking about Rob.]
Gumball: And then Rob tried to blow up the dam and he said "I am your nemesis," but in a cool British that I actually gave him.
[Flashback to Gumball and Penny on a rollercoaster.]
Gumball: This reminds me of that time the bus went through that tunnel, and Rob tried to blow it up, but obviously I thwarted him by wrestling on the wing of a plane. [As Gumball goes on, Penny gets off the ride, annoyed.]
[Cut back to the present day.]
Gumball: And then I saw Rob at the mall and explained to Penny about how like, Rob's my nemesis.
Penny: Yeah, Gumball, that's right now.
[Gumball peers out from behind the phone. He then gasps as he sees Rob go into the hardware store.]
Gumball: He's gone into the hardware store! He's probably getting stuff for me, you know, stuff to destroy me with. Oh my gosh, he can't see me here! [Pushes Penny out from behind the phone.] What's he buying? No, don't tell me. No, tell me! No, don't tell me! Just give me a clue. Okay, two clues!
Penny: Mmm...he seems to be buying a circular saw.
Gumball: [Squeals.] Is the blade diamond edged?
Penny: No, just a regular blade.
Gumball: That's okay, we're not there yet.
Penny: Wait, he's leaving. I think he's getting a coffee.
Gumball: Looks like someone wants to stay up all night creating plans to destroy me.
Penny: It's decaf.
Gumball: Oh...looks like someone wants to sleep well so he can wake up early and create plans to destroy me.
Penny: What is it with you two?
Gumball: We're nemeseesees. Nemesises? Nemesis?
Gumball: You wouldn't understand. [Gumball's phone buzzes. He then checks it.]
Phone: You have one unread threatening message.
Gumball: [Squeals.] It's from Rob! I'm too excited, you read it!
Penny: [Sighs in annoyance as she takes Gumball's phone.] "I hate you more than anything in the world."
Gumball: [Gasps and puts one hand on his face.]
Penny: "I'm gonna smoosh you out of your yellow skin."
Gumball: [Gasps and puts his other hand on his face.] Okay, he's color blind, never mentioned that before, but secrets are fine!
Penny: "I hate your slimy, banana-ry guts."
Gumball: [Gasps and sticks his leg onto the side of his head.] It's a bit weird to call my guts banana-ry but let's just go with it.
Penny: "You are my nemesis... Banana Joe?"
Gumball: [Kicks himself in the face and gets up after falling down.] It's a weird new nickname for me, but it's still good to know he's thinking about me.
Penny: I don't think that message was for you.
Gumball: It's obviously just some sort of mistake. [He shakes his head in denial and starts walking towards Rob.] I'll just ask Rob.