The series revolves around the life of Gumball Watterson, a 12-year old cat who attends middle school in Elmore. Accompanied by his pet, adoptive brother, and best friend Darwin Watterson, he frequently finds himself involved in various shenanigans around the city, during which he interacts with various family members: Anais, Richard, and Nicole Watterson, and other various citizens.
Gumball and Darwin are wary of Anais' new friend.
The guys find evil plans on Alan's memory stick and try to stop him from carrying them out.
Nicole reminisces about how she met Richard during a family dinner.
The family go without wi-fi after Mr. Robinson changes the passcode, so Gumball tries to recover it.
Carrie backs up Gumball's ghost story, and the students want to hire them as ghost exterminators for Halloween candy.
Gumball takes a personality test that labels him "The Loser" and he tries to shake the label.
Rocky decides to stop living life online, and find love on a dating app, and Gumball and Darwin try to help him.
Gumball and Darwin give Bobert instructions so he will behave in a safe and responsible manner, but he applies his logic to their rules.
Gumball and Darwin are confused when they meet Chi Chi and Ribbit, a pair of goat and frog siblings that copy everything they do and say. Then they find out this copycat family is making money online from imitating the Watterson family.
When Darwin has lunch with Idaho, he decides to stop eating potatoes in solidarity with his brotato, but he finds his obsession with his favorite food harder to kick than he ever imagined, so Gumball decides to help his friend curb his carb cravings.
Nicole tries, and fails, to hide her disappointment when Richard and the kids fail to remember her special day. Richard has to figure out what special day he has actually forgotten and then make it a day to remember or else.
When the family goes to visit Richard's dad, Frankie, who lives in a trailer in the town dump, they assume that he's done time in prison based on his extended absence from Richard's life and try to make him feel more at home.
Sick of Granny Jojo's ugly gifts, Nicole encourages the kids to take matters into their own hands and accidentally break her latest hideous vase. But when Gumball, Darwin and Anais try to destroy it, they discover it is more robust than it seems.
Gumball enlists Carrie to help bring Darwin and Teri together, but when they can't make Darwin and Teri's love blossom naturally, they decide to make it happen supernaturally.
The Wattersons receive an unmarked package in the mail. To distract themselves from the urge to open it they all take turns to imagine what it might contain.
When everyone gives Gumball a cursed video game console, Elmore becomes trapped inside a fantasy RPG world. Gumball, Darwin and Anais have to battle their way through town, unraveling the secrets of their new virtual reality.
Gumball teaches Darwin everything he knows about the world of skateboarding.
When Gumball and Darwin realize Grandpa Louie has no friends, they create one called Muriel, when Granny Jojo finds out Louie has been spending time online with another "woman", Muriel not existing isn't going to stop her from being destroyed.
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.
Gumball and Darwin discover the reason Dad’s diet wasn’t working was that he was actually one of 10 of them and eating a meal for each of them. They eventually manage to help him lose weight, but Richard’s newfound buffness also brings out his more obnoxious side.
When Gumball learns that his nemesis, Rob, has found a new nemesis, he tries to sabotage Rob's new "enemy-ship", much to the frustration of Penny.
Gumball refuses to accept he is the only kid at school that doesn't have special powers. He convinces Mrs. Jötunheim, Hector's mom, to take him on as her apprentice but she soon learns leaving Gumball unsupervised around magic is a big mistake.
The prize jewel on the Secret Joyful Burger menu is a mysterious burger, but to order it you need to know its name. When Larry refuses to tell them what it's called, they go to super-sized lengths to discover it.
Gumball and Darwin are desperate to meet Ocho's famous uncle.
When they see the school bullies making fun of Sussie, Gumball and Darwin decide to try and help her act less weird. They carefully observe her behavior and decide that the only thing they have to change is absolutely everything.
Richard discovers that going into a bank whilst wearing a motorcycle helmet can land you in a lot of trouble.
Join the citizens of Elmore for a song and dance spectacular that will have people covering their ears with joy.
No matter what Gumball does, Carmen thinks she knows better; when Gumball attempts to gain the moral high ground, but fails, his only option left is to bring Carmen down to his level.
The Wattersons compete over who has the worst life.
Richard goes on strike to prove that his work around the house is under appreciated by Nicole.
When Leslie's petals begin falling off, he feels like his good looks are fading, so Gumball and Darwin use everything they know about style and beauty to try and help him.
Darwin is delighted when they discover their old childhood toys, but soon realizes that some things are best left in the past.
The Wattersons fear the worst when they are summoned to a Town Hall meeting, but are surprised when they're offered a new house - until they discover it's in a different state.
The Wattersons will do whatever it takes to get into the first screening of the latest Stellar Odyssey sequel.
When the kids find out that Mom's life hasn't panned out as she'd hoped, they start taking on her chores, but they accidentally grab her bucket list instead of her to-do list.
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