4x1 – The Return
Richard tries to find Gumball, Darwin and Anais in their first day at school before Nicole notices they're gone.
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4x2 – The Nemesis
Gumball and Darwin discover that Rob, who once swore to wreak vengeance on them, has been trying to destroy them for some time - but his traps never work.
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4x3 – The Crew
When Gumball and Darwin decide it's time they join a crew, they agree that the coolest posse in Elmore is the Senior Citizens.
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4x4 – The Others
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.
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4x5 – The Signature
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 (as his father) 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...
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4x6 – The Check
Gumball, Darwin and Anais are delighted when Grandpa Louie gives them a check for $5000. They immediately start fantasizing over what to spend it on. But when Mom and Dad say they're going to spend the money on paying bills instead, it's a race to the bank to see who can cash the check first.
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4x7 – The Pest
When they find Anais training for a brutal showdown, Gumball and Darwin realize that their sister is being pestered at school by an annoying kid: Billy. They try to teach her how to resolve the problem peacefully, but Billy has other ideas.
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4x8 – The Sale
Gumball and Darwin are devastated to learn that Mr. Robinson is selling his house and leaving town. When they realize that making some final memories with Mr. Robinson is not enough, they decide to sabotage the sale.
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4x9 – The Gift
After they receive an extravagant invitation to Masami's birthday party, Gumball and Darwin are anxious to find just the right gift for her.
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4x10 – The Parking
The Wattersons' search for a parking space at the mall takes a little longer than expected. When the Wattersons arrive at the mall for a day of shopping, they struggle to find a space in the parking lot. They search for a space everywhere -- using all their intelligence, cunning and trickery -- but as the day goes on, the desperate hunt for a space becomes more important than the trip to the mall itself.
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4x11 – The Routine
Mom and the kids depart for their hard day's work, leaving a seemingly lazy Dad half-asleep on the sofa. Mom has given him one very simple job: buy mayonnaise. However, Dad manages to turn this mundane task into an epic quest, showing that his daily routine isn't as inactive as his family imagine.
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4x12 – The Upgrade
Gumball and Darwin see an advert for the latest, cutting-edge Bobert operating system and excitedly talk Bobert into downloading it. At first it seems like a massive improvement, but the many flaws in the new operating system become increasingly apparent.
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4x13 – The Comic
Gumball is the star of his own comic, but struggles to match up to his heroic alter-ego.
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4x14 – The Romantic
After Gumball convinces himself that Penny doesn't love him as much as she used to, he decides to put together a romantic quest to remind her of all the good times they've had together. But Gumball's romantic gesture backfires, landing Penny -- and maybe their relationship -- in serious peril.
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4x15 – The Uploads
Gumball goes onto Elmore Stream-It, but is immediately interrupted by Darwin's protest. Gumball begs Darwin to just let him see one video, but Darwin continues. He gets Gumball to back away from the computer and turn around, revealing that he has the mouse in his hand.
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4x16 – The Apprentice
Gumball sets out to prove to Penny's father that he's good enough for his daughter. Gumball decides that the best way to prove to Mr. Fitzgerald that he's good enough for Penny is to become his apprentice for the day. The problem is, Mr. Fitzgerald has an important interview and Gumball's enthusiastic attempts to help him might actually do more harm than good, both to Mr. Fitzgerald's business and to Gumball's future with Penny.
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4x17 – The Hug
Gumball tries to prove he's not predictable.
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4x18 – The Wicked
Gumball and Darwin try to find just one good quality about their neighbor, Mrs. Robinson.
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4x19 – The Traitor
Gumball calls Alan a traitor when Gumball thinks Alan lied to get out of having dinner together.
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4x20 – The Origins Part 1
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.
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4x21 – The Origins Part 2
Darwin tries to return to his family after accidentally getting flushed down the toilet.
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4x22 – The Girlfriend
Jamie decides she needs a sweetheart and, unlucky for him, Darwin is chosen.
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4x23 – The Advice
Gumball and Darwin try to comfort the disillusioned Mr. Small by taking his advice and proving that he is a good teacher.
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4x24 – The Signal
Gumball develops a strange stutter, and it makes him accidentally offend Darwin.
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4x25 – The Parasite
Anais makes a new friend at school whom Gumball and Darwin believe to be a social parasite.
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4x26 – The Love
The people of Elmore explain to Bobert the meaning of love.
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4x27 – The Awkwardness
While going to the store to get ketchup, Gumball runs into Hot Dog Guy again.
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4x28 – The Nest
After people in Elmore start to go missing, it's up to Gumball and Darwin to figure out why this is happening.
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4x29 – The Points
Gumball and Darwin have to do Tobias' chores for using his points in a video game.
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4x30 – The Bus
Four parents try to teach the students of Elmore High a lesson about skipping school.
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4x31 – The Night
The Moon examines dreams of Elmore residents.
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4x32 – The Misunderstandings
Gumball has a misunderstanding with Penny about a date.
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4x33 – The Roots
The family try to make Darwin connect with his fish roots.
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4x34 – The Blame
Billy passes out after playing video games and his mother tries to ban them.
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4x35 – The Slap
Gumball wants to be greeted by Tobias with his special high five slap.
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4x36 – The Detective
Anais believes Gumball and Darwin stole Daisy, so they'll need to found it.
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4x37 – The Fury
A strange figure arrives and insults Nicole, but the kids are surprised when Nicole doesn't fight back.
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4x38 – The Compilation
A compilation of the funniest and craziest videos the inhabitants of Elmore have uploaded to the Internet.
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4x39 – The Scam
Gumball wants to show that the school is haunted.
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4x40 – The Disaster
Rob finds a remote that controls the universe and travels back in time to enact revenge on Gumball.
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