Gumball and Darwin's voices may be breaking, but they're showing no signs of growing up. Whilst Gumball and Darwin make fun of Mom and Dad for being old, their voices start to break. They try to ignore it, but everybody they meet reacts to their new and unpredictable voices.

New Elmore Junior High student Sarah becomes Gumball and Darwin's obsessive number-one fan.

The new coach at Elmore High stands up to Jamie. The new Coach witnesses Jamie bullying the other kids at lunch and steps in. Jamie is made to apologize, much to the amazement of the other kids. Gumball and Darwin worry about Jamie seeking revenge, especially when they see her sneaking into the back of Coach's car.

When Miss Simian sees Gumball and Darwin joyful on Monday, she knows that something is wrong with them. She performs tests on them, but the nurse disapproves what she's doing. But suddenly, Gumball and Darwin start to infect the school with the 'Joy Virus', and it's up to Miss Simian and her tape player to cure the students.

The Watterson children's long-awaited pet puppy turns out to be a turtle which hates them.

Gumball and Darwin discover the secret behind their classmate Anton's immortality.

When Mom reveals that Gumball's real name is "Zach," Gumball adopts a cheesy, annoying persona to match the name. His family tries to make him remember the old Gumball, as this new Zach persona is progressively taking over Gumball's life and erasing his memories.

Skits about the random extra characters seen throughout the series.

When Gumball and Darwin begin to complain about every little thing in their lives, the people of Elmore City mistakenly assumes charity cases and put together a benefit to raise money for them, leaving them having to fix the mix-up.

While driving to a campground, Nicole tells a horror story, which slowly starts to come true as their car breaks down and a stranger comes to help them out.

Gumball and Darwin discover Principal Brown's diploma is fake, and Principal Brown is determined to keep their discovery a secret.

When Gumball and Darwin investigate a missing classmate, they discover a far greater mystery... about Elmore.

Mr. Robinson 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.

Clayton, a compulsive liar tells Gumball and Darwin about his awesome martial arts move, and discover that he wasn't lying.

Doughnut Cop shows Gumball and Darwin that the smallest misdemeanor can lead to a breakdown in law.

Gumball needs to find a cure for Darwin's allergy before he sneezes Elmore off the map.

It's Mother's Day and kids put their moms through a series of tests to determine who has the World's Greatest Mom.

Gumball and Darwin are shocked to discover that Anais is Dad's favorite child.

Gumball and Darwin spend the day doing other things instead of taking out the trash like their mother told them to do before she got back home.

Gumball inadvertently cracks open Penny's shell, and discovers who she really is inside...