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Nicktoons: The Dark Ages by Frozarburst
Fandoms: Hazbin Hotel (Cartoon), Helluva Boss (Web Series), Danny Phantom, The Adventures of Jimmy Neutron: Boy Genius, Fairly OddParents, SpongeBob SquarePants (Cartoon), My Life as a Teenage Robot, El Tigre: The Adventures of Manny Rivera, The Loud House (Cartoon), Doom (Video Games), Nicktoons (Video Games)
05 Oct 2025
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Summary
The forces of Heaven and Hell have come to blows for territory in the Nicktoons Universe, bringing Spongebob Squarepants, Danny Phantom, Jimmy Neutron, and Timmy Turner into the mix. Separated and corrupted, it's up to the four heroes and their allies to reunite and put an end to the war for reality. But in their adventures, they quickly discover that the conflict runs deeper than they can imagine.
Series
- Part 2 of Nicktoons Adventures
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The Good, The Bad, And The Wealthy by Acaciathorn
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
03 Oct 2025
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Summary
Have you ever wondered what the cast of Jimmy Neutron would be like if they were born and grew up in the mid-1800s? You probably haven't — but I have. So come on, step right up. Feast your eyes upon the JN fandom's only Wild West AU, because there's no fanfiction niche too small for me to fill. [ILLUSTRATED]
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"New Fly On The Block" - Part 1 by RealSpark17822
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
23 Sep 2025
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Summary
Hello. I'll be continuing this new little series of mine, which I've decided to title the "Sucker Series". This next story will actually be in two parts, as I've decided to split up this particular highlight for Sucker into two parts.
Now for the episode, or rather, story description, as before.
"Sucker takes his first visit to Lindburgh Elementary, meeting humans in much greater numbers."Series
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A Million Dreams Ago by beat_me_with_a_bag_of_coins
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
23 Sep 2025
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Summary
“Yes, Cindy?” James asked with a smirk, not looking away from his reflection.
Her face seared with anger. “I thought I told you not to call me that, Neutron,” Cynthia spat with a glare, crossing her arms. Her forest green sequin-adorned dress glimmered in the low light of the break room.
“Come to tell me that you wish I had an aneurysm again?” he chuckled, combing his hair rhythmically and repetitively to get the chocolate brown swirl just right. “Hate to break it to ya, but I think I've heard that line before.”
*•°•*
Set in the mid 1960s, James Neutron is a lonely lounge singer with a dream to be the next Einstein and the ability to store his entire life savings in his front pocket. Oftentimes, he's competing with the other vocalists like Liberty Folfax and Cynthia Vortex for the spotlight. They have the voices of songbirds. Him? He's no Bobby Darin or Frank Sinatra, but it puts bread on the table.
Series
- Part 2 of Jimmy Neutron AU Jamboree
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Bigmouth Strikes Again! by rockstarmoron for katia_dreamer
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
21 Sep 2025
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Summary
A series of one-shots about Retroville's star-crossed bigmouths, Jimmy Neutron and Cindy Vortex. Banter, rivalry, and angsty pining galore! With a bit of fluff thrown in for good measure.
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Emails I Can, Should, and Must Send by messofthejess for rockstarmoron
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
20 Sep 2025
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Summary
Jimmy and Cindy are geographically separated for the summer. Do you really think that's going to stop them from talking?
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Nicktoons: The Phantom Genie Saga by NickFan108
Fandoms: The Adventures of Jimmy Neutron: Boy Genius, Fairly OddParents, Danny Phantom, SpongeBob SquarePants (Cartoon), Nicktoons (Video Games), Avatar: The Last Airbender (Cartoon 2005), Rugrats & All Grown Up! (Cartoons), Star Trek: The Original Series, Blue's Clues, Kung Fu Panda (Movies), Hey Arnold!, Phineas and Ferb, Teen Titans (Animated Series), Spider-Man: The Animated Series (Cartoon 1994)
18 Sep 2025
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Summary
Sometime after the defeat of the Evil Syndicate, Dark Danny breaks out of the Ghost Zone and forms an alliance with Norm the Genie in an attempt to get revenge on Danny. But when their machinations threaten the stability of all existence, the Nicktoons must unite once again as they scour the multiverse for the means to help them. And maybe make some new friends along the way...
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The Adventures of Jimmy Neutron, Boy Genius: Quantum Chaos by NickFan108
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
18 Sep 2025
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Summary
In my head-canon finale for the series, Jimmy's life is finally starting to fall into place. From "Stranded" to "Jimmy Timmy Power Hour 3: The Jerkinators", Jimmy and Cindy are close to becoming an official couple. And since there hasn't been a major incident in weeks, Jimmy decides it's time to try his most dangerous experiment yet: quantum realities. All rights go to Nickelodeon.
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Party at a Rich Dude’s House (2025) by lexaleigh
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
17 Sep 2025
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Inspired by the song “Party at a Rich Dude’s House” by Kesha.
Eustace Strych is throwing a party. Jimmy and friends crash it. Drama and hilarity ensue. -
It All Comes Back to You by messofthejess for rockstarmoron
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
10 Sep 2025
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Summary
After finishing her Master's degree, Cindy finds herself at a bit of a loss for what to do next in her life. Returning to Retroville after so long isn't ideal, but at least it's a step forward.
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Summary
She lived in apartment 23B. Second floor, first door on your right. Next to mine. I never intended to fall in love with her. I never intended to fall in love with anyone. But...she's different.
A Jimmy/Cindy love story that takes place in an apartment complex. Rated M for sexual content and adult themes.
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Indigo: Series Two by SaraTheKhaleesi
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
27 Aug 2025
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Summary
In the end, they were parents. And no matter what life threw at them, they had to be strong, for her. When two very different lives collide and temptations rise, the family must adapt and find a way to deal with this new, chaotic, normal.
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Jimmy/Cindy focused. Set post high school. Sequel to "Pink". Rated M for sexual content and strong adult themes. Currently in progress.
Series
- Part 2 of Pink, The Series
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Summary
Jimmy is sitting in the learning center when a bag slams down on the table in front of. Dust and dirt fall from the backpack to the wood of the desk. Frowning, Jimmy moves the papers away.
“Oh,” Comes from the mouth of an uncharacteristically worried Nick Dean. The usual, half-lidded expression of his is replaced with something harsher, tenser. “It’s you.”
It’s even weirder to see him *here* of all places, a learning center. Jimmy hasn’t seen Nick in awhile. He’s almost certain that Nick’s the type to play hooky or skip out on assignments, projects, tests, which only makes it even stranger that he decided to come *here,* to a tutoring center.
“What are you doing here?” Jimmy asks, confused.
“What is everyone here for?” Nick grumbles, taking a seat.
Nick and Jimmy tutor each other (in more than one subject) during their highschool years.
(This fic was written with a lot of support and input from my good friend and fellow artist/writer, @ghostierealm! Please go check out their art for this fic on IG:
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The Jimmy Neutron Cast Watch Runaway Rocketboy by Skatoonyfan1234
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
22 Jun 2025
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Summary
The cast of Jimmy Neutron are brought to a very special room to watch the pilot film of Jimmy Neutron - 'Runaway Rocketboy'. How will they react to it?
[i do not and never will own Jimmy Neutron]
Series
- Part 9 of Reaction Stories
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Jimmy Neutron: Teen Genius by SpongeGuy
Fandoms: The Adventures of Jimmy Neutron: Boy Genius, Nicktoons (Video Games)
15 Jun 2025
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Summary
First installment in an overall series. Jimmy Neutron is 14 years old now, and his life is a mess. Wearing a charismatic mask, he is trying to make up for his mistakes. Can he survive his first year of high school and the biggest villain attack on Retroville yet, and will he learn to let people in? Or will another person be hurt by Jimmy Neutron, Teen Genius?
Series
- Part 1 of Nicktoon Cinematic Universe
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Summary
Focal Character—Sheen
Age—College age (early twenties)
Rating—Teen and up for language, implied sexual content, alcohol, and tobacco
Summary: Sheen learns to set boundaries with Libby after their breakup.Series
- Part 4 of How to Lose a Girl in Seven Stories
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Neutron Rewired: The Gia Martinez Chronicles by Dabriaaikoo
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
07 Jun 2025
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A new family arrives in Retroville—but they’re anything but ordinary. When Gia Martinez steps out of a hover car with pink goggles and a robotic cat, Jimmy Neutron’s peaceful neighborhood life glitches. Competition? Maybe. A connection? Definitely. And she’s just getting started.
- Language:
- English
- Words:
- 1,071
- Chapters:
- 1/15
- Hits:
- 10
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Exhibit Origins by BackTo1993, BluePenDragon
Fandoms: Night at the Museum (Movies), Unwind Dystology - Neal Shusterman, The Adventures of Jimmy Neutron: Boy Genius, Back to the Future (Movies)
18 May 2025
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Summary
The collected origins of Exhibit AWOL's cast and set up before the events of Exhibt AWOL
Series
- Part 1 of Exhibit AWOL series
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When the Chips are Down... by messofthejess
Fandoms: The Adventures of Jimmy Neutron: Boy Genius
16 May 2025
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Summary
The boys headed to Las Vegas for Sheen's bachelor party; the girls crashed the festivities a few hours later. This is the day after.
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Jimmy Neutron: Encanto Genius by Skatoonyfan1234
Fandoms: Encanto (2021), The Adventures of Jimmy Neutron: Boy Genius
31 Mar 2025
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Summary
A Encanto & Jimmy Neutron Boy Genius crossover.
When Mirabel's door vanished on her gift ceremony, Alma asked her son Bruno to look into the future to see why. But the vision he had didn't show Mirabel in front of a cracked Casita. Instead, what it showed was A very different person - a boy with a big head, giant flying chickens, and monsters shaped like floating eggs, all of which he knows are NOT in the Encanto.
But the Madrigals NEVER expected 10 year old boy genius Jimmy Neutron, to enter their world, and in turn, end up on a mission with the kids to rescue all of Retroville's parents from evil aliens called the Yolkians.
Funny how things work out.
But will Jimmy, the Madrigals and the kids save Retroville's parents?
Will Mirabel see she's special as her family?
Will Jimmy understand how much family means to him and his friends?
And will they all learn important lessons along the way about family bonds that should never be torn apart?
You'll just have to read to find out!
[i do not own Encanto or Jimmy Neutron]
Series
- Part 18 of Totally Bonkers Crossovers
- Part 12 of My Encanto Stories