Mr. Robertson has a stress attack and needs a stuffing transfusion from his son Rocky the janitor. He won't take it unless Rocky gets a better job in life. Rocky gets one with Chanax, where he becomes a work drone. Gumball and Darwin now need to get Rocky's soul back from his boss in order to get him to surgery.
When Anais reveals that she's in the grade above them at school, Gumball and Darwin's eyes are suddenly opened to a whole new world of other students at Elmore Junior High. Gumball is horrified to learn that there are a bunch of characters who are barely aware of his existence and is determined to force his way into their lives.
Dad discovers that Granny Jojo and Louie are planning to get married and move to Florida. To stop this happening he adopts Louie so that he can forbid him from marrying Granny Jojo. But this triggers a series of adoptions within the family which quickly spirals out of control, and causes the unexpected return of someone from Dad's past
When Mom and Dad struggle to keep hyperactive, toddler-aged Gumball from trashing the house and exhausting them, they decide to buy him a pet. It works, but there’s a problem: every goldfish they get him is short-lived, and inevitably ends up being flushed down the toilet. However, when Dad buys a talking goldfish from a mysterious shop, Gumball meets the best friend he’ll ever have. Having been accidentally flushed down the toilet, Darwin has to find his way back to his new family. Via the sewers, Darwin finds himself flushed out to sea. He is terrified, but determined to make his way back to the Wattersons. However, a fish can’t get very far on land, so Darwin will have to do millions of years of evolution in a matter of hours if he’s going to get home safe and sound.
After the wifi goes down (and Richard confesses that their connection is from the Robinsons as the Wattersons' credit is so bad, they can't afford to get the Internet for themselves), Gumball and Darwin try to live without Internet by making real-life equivalents of everything associated with the Internet (email, social media, gaming, leaving bad reviews for products and services). When that doesn't work, the Watterson kids decide to hack Mr. Robinson's account.
Gumball, Darwin and Anais discover that Mr. Wilson has been picking on their Dad for most of his life; ever since he humiliated Richard with a high school prank. The kids try to work Dad through it but when their efforts fail, they realize that getting back at Mr. Wilson is the only way to break the cycle.
When Dad gives Larry’s hairdresser a bad review for saying he’s bald, he gets offered a free haircut. This inspires Gumball and Darwin to go on a reviewing spree across town, forcing Larry to give them stuff with the threat of a bad review. Just because the customer is always right doesn’t mean that what they’re doing isn’t wrong.
Miss Simian discovers a failed test from Gumball’s past that brings down his grade point average. This means he has to retake kindergarten all over again, much to her delight. But by demoting him, Miss Simian has inadvertently brought herself down, and they’re left with no choice but to team up if they want things back to normal.
When Principal Brown has to take the bus, he and Gumball relate their grievances about their respective girlfriends (Miss Simian's bad morning breath and Penny's irritable laugh). They make a deal to tell each other's girlfriends about their issues, but Principal Brown backs out on his end, causing Gumball to pester him.
After accidentally bumping into each other in the grocery aisle, Nicole and her parents have it out. The Wattersons discover why Nicole and her parents haven’t been on speaking terms for so long. The kids decide to bring about a reunion, in order to secure the backlog of birthday and holiday presents...
Richard doesn't answer the door in time and the jobsworth delivery guy will not let him have his package. His options are to pick his package up at the depot or pay for a redelivery. Richard doesn't like the sound of either option, so a battle of wills begins that can only end in the destruction of one or both of them.
Darwin and Gumball feel each other and describe it.
Gumball thinks he is allergic to himself and accidentally sneezes his mouth onto a pineapple. The pineapple is just about to start singing when Darwin tears his mouth off and puts it onto Gumball. The pineapple says this was the best day of his life and Gumball and Darwin ask each other if they heard anything.
Gumball and Darwin become their hand puppets' hand puppets.
Gumball and Darwin come across a bowl of weird purple food while walking around. Gumball says he has seen it before in his dreams and eats it. Darwin asks him if any weird side effects happened, but Gumball just shrugs it off.
Darwin tries to share his drink with BirdPlaneBird.
Darwin imagines a gnome while Gumball tries to imagine something else, but fails and keeps imagining gnomes as well.
Gumball makes Darwin mad because of his puppet's voice so Darwin gives Gumball the taste of his own medicine.
Darwin accidentally imagines a beard on himself so Gumball helps.
Howdy, Grady, and Frank organise a party for Gumball and Darwin, but Frank is devastated when they fail to show up. After Frank's song, Gumball and Darwin find the puppets and Frank becomes happy again.
Grady lost his precious spoon and Frank is the one who has it. Thinking it is a balloon, he refuses to give it to Grady so they have a dance battle for it. The winner of the spoon is Keyboard Dog. Angered, Grady breaks the spoon. Frank then shows him his collection of spoons to cheer him up.
Grady and Howdy want to make a TV show, but they cannot figure out whether to make a documentary or a fun show. They ask Frank for his opinion, but he does not help them. In the end, Grady decides to make a documentary about mud and Howdy, who still wants to make a fun show, is his guest. Grady ends up covered in mud, but he is unbothered because the audience loves the show.
Grady wants his friends to help him clean the house when they are playing video games.
Frank is bored so he keeps annoying Grady and Howdy. After their failed attempts to entertain Frank, he realizes the word he wanted to say is not bored, but sleepy. Grady and Howdy tell him to go to sleep and he falls on the floor sleeping.