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One Last Second Chance by AlleyCatGotYourBack
Fandoms: Teenage Mutant Ninja Turtles (TV 2012), Teenage Mutant Ninja Turtles - All Media Types
06 Sep 2025
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Summary
The world has ended. The Kraang have decimated the planet, and only a few straggling survivors still cling to life. Among those few are Donatello and Casey Jones. Donatello figures that there's no point in trying to fix what's happened. But maybe he can prevent it from happening all together. So, he does what any normal turtle would do and builds a time machine to take him and Casey back in time and hopefully, from the shadows, they can save their past selves from following the same road to destruction. Maybe then, he can start to be forgiven for not seeing it coming.
He didn't account for how hard it would be to stay away from the version of his family that's still alive and happy.
Casey Jones just wants to protect the only person he still has left and possibly save the world while he's at it. Trying to find a purpose in a world that already has a Casey Jones and trying to find some small bits of a peace in a world on the highway to destruction.Neither one of them are very good at sticking to the plan, however, and soon enough, they'll have to contend with family dynamics, memories, and finding your place in a world with no need for extras.
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Four Turtles and A Group of Teenagers by LuminousRain
Fandoms: Teenage Mutant Ninja Turtles (TV 2012)
04 Sep 2025
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Its been a long three months since the Invasion and takeover of New York, but things are finally looking up. Now the seven teenagers need to find a way to get their city, family, and friends back.
Chapter 14 contains a reference sheet for Li Kendra
Chapter 16 contains a reference sheet for Mondo Gecko
Chapter 18 contains a reference sheet for Renet
Chapter 21 contains an artwork of ???
Chapter 22 contains a reference sheet for Raphael
Chapter 23 contains a reference sheet for Leo
Chapter 25 contain a reference sheet for IrmaSeries
- Part 6 of Four Turtles, A Rat, and a Teenage Girl
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I'm Not An Organ Donor by Crowdog
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles - All Media Types
03 Sep 2025
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Merging with a Technodrome has life altering consequences... or more specifically life ending ones. While dying is uncomfortable, awkward, (and a bit of a chore,) the idea of his family continuing on without his technical skills is unbearable. Literally the pineapple on his pizza. The concept is so grating that Donnie will do anything to make sure his family is taken care of once he's gone: Even if it means transplanting another version of himself from another timeline to take up the job opening.
In Casey's Timeline his Donatello died in an extremely convenient-to-obscure way. A body was never found and his death was never explicitly witnessed. The only reason they know Master Donatello "died" is because his circumstances were "inescapable" but Donnie is sure he can put up some air quotes. Removing this other Donatello from Casey's Timeline wouldn't change the future that has already happened or create a new timeline. So what's the harm in taking someone from a timeline that doesn't need them anymore?
Or: Donnie needs to replace himself before he dies at the young age of seventeen and Master Donatello becomes the candidate for that endeavor... by force.
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Love Makes You Do Crazy Things by Virameows
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)
03 Sep 2025
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Summary
Donatello realizes he has fallen in love with the girl he has sworn he hates, he has no idea how to handle all these new emotions flooding his mind. Leonardo does his best to try and ground him, but Donatello decides he is going to rogue and he may end up regretting it.
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It All Starts in the Nurse's Office by DiamondShard143
Fandoms: Teenage Mutant Ninja Turtles: Mutant Mayhem (Movie 2023)
27 Aug 2025
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The turtles have gotten themselves caught up in another crazy day, this one ending in a different person's office: the nurse's.
Series
- Part 2 of It All Starts in...
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TMNT: Scientific Interference(Version 2.0) by StarrBerryOddity
Fandoms: Teenage Mutant Ninja Turtles (TV 2003), Teenage Mutant Ninja Turtles - All Media Types
22 Aug 2025
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We’ve all heard of tmnt separated aus. From one turtle to all being separated,it’s not an uncommon trope nowadays.
But,has anyone ever thought of what would happen if one turtle,from a rather underrated iteration,was separated from his brothers and raised in the hands of a rather underrated villain?
Welcome to TMNT: Scientific Interference! A 2003 separated Au that features fluff,family drama and a somehow even more angsty Leo! Please enjoy,and thank you for reading : ]
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I Made Sure To Bleach Your Tiles by Conartist170 for TheGlobglogabgalab
Fandoms: Teenage Mutant Ninja Turtles (TV 2012)
21 Aug 2025
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Donatello ran. He ran from the fear, he ran from the memories, he ran from his brothers.
He ran from the broken bowl he shattered.
Donatello ran, crying and choking on something unbearably sharp and just as terrible.
Donatello ran...but he wanted to go back. Even if it hurt.
Or; Donatello tries and Casey just wants to be helpful.
Series
- Part 3 of Crystal Black Waters
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newcomb's problem by divisionbell
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)
28 Jul 2025
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Summary
"You watched me kill myself in that labour camp."
Casey's head whips around, heart seizing in his chest. Master Donatello meets his gaze from across the room, as inscrutable as ever. He could be mistaken for bored in the way he's leaning loose-limbed against the counter, phone held in one hand and coffee cup in the other, but his eyes are sharp and dark and calculating in the low light of the kitchen, and they pin Casey in place in a way that makes the hair on the back of his neck stand up.
"What?" Casey rasps, now far, far too awake.
"You watched me kill myself," Master Donatello repeats. Curt, to the point. Disinterested. "In the labour camp. The Krang colony in Rhode Island, right?"
It's been two months and seven days after the Invasion. Casey Jones Jr. is not thinking about anything at all.
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Set loosely in the 2012-verse but no where specific in the timeline.
Donnie and Mikey are ambushed by the foot, Mikey escapes to get help but Donnie is captured. His family spends the next month trying to find him and when they do, How are they going to deal with the consequences? And how are they going to convince Donnie that he’s actually been rescued?
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The Journal of Hamato Leonardo (3) by Slady
Fandoms: Teenage Mutant Ninja Turtles - All Media Types, Teenage Mutant Ninja Turtles (TV 2012)
15 Jul 2025
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2012 “Teenage Mutant Ninja Turtles”
Daily updates for each episode of Season Three from the perspective of the turtle team leader Leonardo.
Series
- Part 3 of 2012 The Journal of Hamato Leonardo
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Never once your son (Forever your greatest creation,) by Stars_not_focused
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)
13 Jul 2025
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Time travel isn’t easy and it doesn’t come without side effects.
…
In unrelated news, the turtles find a feral child running around New York.
(Aka the author makes up lore for the future timeline/Casey Jr/ how time travel works because I can)
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Summary
Casey reflects on his and his friends' current situation while the farm experiences some really heavy rainfall (the annoying of Donnie and bonding with Raph ensues).
Series
- Part 3 of Casey and Raph Bonding
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Thoughts About a Boy by jaywritezshitz
Fandoms: Teenage Mutant Ninja Turtles - All Media Types, Teenage Mutant Ninja Turtles (TV 2012)
07 Jul 2025
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A series of unsent letters from one Hamato Donatello to a certain Casey Jones; letters which remain unsent, but not unread.
Or: Donnie deals with his obsessive tendencies through writing letters.
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You're a Mutant Ninja Turtle Teen?! by Benny_Delirious
Fandoms: Teenage Mutant Ninja Turtles (TV 2012)
04 Jul 2025
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Summary
Arnold had a hard enough life being a single dad with two kids. What would be his reaction to suddenly spot a mutant turtle in his son's room one fateful day??
And why does his daughter, Angel, already seem to recognize this guy??
And why is he wearing a purple bandanna as a mask??
Average day in New York, ammiright??
[some spanish sentences with english translations provided]Series
- Part 3 of Jonatello brainrot has consumed me
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Broken Mirrors and a Bloody Floor, Forgotten is the One who I was Before by Trickster_from_beyond_16
Fandoms: Teenage Mutant Ninja Turtles (TV 2012)
07 Jun 2025
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Summary
Donatello Hamato lived a hard life, he lost many things- His father, his childhood innocence, his close bond with his siblings and most of all...his sanity. He is now a mere husk of the turtle he once, with a slipping mind and a broken thread of everything he used to be. He is fine though, he promises.
The universe however doesn't believe him when he says so, so it chooses to send him back in time. Donatello doesn't complain, he takes his chance to make the lives of his family better. He chooses not to let them down.
Little does he know just how much his past life's trauma will bleed through....and how much he underestimated his family's love for him.
TL:DR- Donnie is thrown back in time without giving his consent, still he takes the chance to fix things but oops! He's mentally unstable and that scares the shit outta his brothers lol
Series
- Part 3 of 2012 Donatello appreciation 🐢💜
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Multiuniversal Chaos by JuniperNauta
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles - All Media Types, Teenage Mutant Ninja Turtles (TV 2012)
04 Jun 2025
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Summary
TMNT 2012 x ROTTMNT 2018
2017: The Foot Clan look for an unknow warrior, who can beat their asses, and the turtles are curious. Luckily, they meet him first, and he's a human from a different universe. He ruined the Foot Clan's Portalmachine, so he can't just go home. Meanwhile, a new guest arrives, also from that world. CJ and Leon are strange, but on a good way. However, Karai knows Leon from somewhere.
2021: CJ is missing and Leo was worrying until he found a way to him. Unfortunately for Don, his dumdum twin didn't explain anything, so now, he has two missing familymembers.
2012!Band doesn't know that CJ is Casey or Leon is Leos alternative version. Let's fun!
Series
- Part 1 of Multiuniversal Chaos AU
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[ BEING REWRITTEN ] Just this once, everybody lives by TheDragonTribes for humanarosonist
Fandoms: Teenage Mutant Ninja Turtles - All Media Types, Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018)
01 Jun 2025
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All of his life, Michelangelo has been the glue that held his family together. No one asked him to, no one told him to, he just took it upon himself one day to dry tears and remind his family they are loved.
And when the world ended Mikey gathered up all the people he could reach into his arms and shielded them from the roaring tsunami that threatened to consume them all, and when the waves claimed some of the people he protected he just held tighter and refused to let the remaining ones shatter.
He has seen thousands and thousands of people die, felt when their spirits left the physical plane and went somewhere he couldn’t protect them, and with every death the fire in his chest burned brighter and brighter.
So when the resistance fell and his only remaining sibling asked him to sacrifice himself to send their last hope to the past, Mikey called upon that roaring bonfire in his chest and said, “We’re not letting anyone else die.”
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Or; Mikey took one look at Leo’s defeated expression and decided his family had done enough self-sacrificing
Or; Mikey grabbed his idiot family and said “Fuck it we ball” and dragged them to a happy ending kicking and screaming
Series
- Part 1 of Children of war
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A Mauve Multiverse Malfunction (REWRITE) by Kalkks
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles (TV 2012)
22 May 2025
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Summary
( This is a rewrite of a story I wrote and haven't updated since 2022-2023 )
A Rise + 2012 Crossover
-“Okay.. You ready, Michael?”
Mikey.. was definitely not ready.
“I got this.”
~
Through a major overlook and a test gone wrong, Rise Donnie ends up in a dimension that he's unfamiliar with. Shenanigans and fights ensue. -
you make me like a clown by elio_the_dud for Nardo_the_l0ser
Fandoms: Teenage Mutant Ninja Turtles - All Media Types
21 May 2025
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Summary
Casey pulled on the door. It didn’t budge.
He laughed nervously and straightened up to tug on the door more violently.
“Uh- everything okay?” Raph asked.
Casey turned back to him with an anxious grin. “Well, we might maybe… possibly be… locked in.” He replied sheepishly.
“WHAT.”
or: Raph and Casey get locked in a grocery store
(Written for my TMNT iteration, TMNT!Habromania, but can probably be read as 2003 or 2012)
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A Mauve Multiverse Malfunction (OLD) by Kalkks
Fandoms: Rise of the Teenage Mutant Ninja Turtles (Cartoon 2018), Teenage Mutant Ninja Turtles (TV 2012)
17 May 2025
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Summary
Donnie had been working on this for a few months; a machine that could help Mikey train with his mystic hands, making it so he would be able to open portals a lot easier, with his help of course.
As Donnie began typing away on his laptop, Mikey looked over at the circular machine standing before him before looking back at his brother.
"Are you sure this is gonna work, Don?"
"Of course it will! Why wouldn't it?"
Mikey gave a concerned side-eye look at the equipment wired to his arms. "You know.. Just call it a hunch?"
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TLDR: A crossover where Rise! Donnie gets booted to the 2012 universe (and maybe giving him some very much needed emotional moments)