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The Doctor's Descent by Feanyx1
Fandoms: Undertale (Video Game), Doctor Who (2005), Doctor Who, Deltarune (Video Game)
28 Jun 2025
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Summary
He thought that the radiation would kill him. He thought that his time as the Doctor would come to sad and brutal end. He was wrong. And that was so much worse.
In his efforts to find himself, and without his companions, he accidentally stumbles onto a monstrous civilization miles below the Earth. With his newfound DETERMINATION and some new allies, he'll come to realize what it truly means to be a friend, and learn how to live his last lives with his head held high.
And make sure that, just this once, everybody lives.
OR
Undertale but the Tenth Doctor replaces Frisk. Fluff, angst, AUs, and timeline shenanigans ensue.
*No knowledge of Undertale or Doctor Who is required, though it is helpful if you've experienced at least one of them.
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Three years ago, a brother left his sister to search a mountain that no human has ever returned from.
Three years later, the sister, desperate for answers, follows her brother's footsteps.
The two meet again, but the result is likely the most hectic two weeks of their lives. And one of them has already lived an eventful life.
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Asgore demands all Royal Guardsmen to take down ALL humans!
But uh, Frisk is pretty much the only one down here. Thankfully, Frisk has some pretty peak skeletal figures to help them out.
- Language:
- English
- Words:
- 0
- Chapters:
- 1/?
- Hits:
- 3
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Undertale of the Hill by Doomfan808
Fandoms: King of the Hill (Cartoon), Undertale (Video Game)
28 Jun 2025
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Summary
After a sudden rainstorm causes the Hills to hide in a cave and fall into the underground, they now have to find their way out to the surface and back to Arlen, Texas.
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Sick To Death (Of Me Chasing You) by CrossoverAU
Fandoms: Undertale (Video Game), Alice by Heart - Sheik/Sater/Sater & Nelson
28 Jun 2025
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Summary
Raine was sick. Really sick.
The kind of sick where, despite not knowing what she had, she knew she didn't have long left.
Her best friend Sans knew that too.
Not wanting her to live her last moments trapped in her house, Sans read her one of her favorite stories, Alice in Wonderland.
While chasing her through the pages, Sans learns that he loves her too much to let her die.
Will he be able to let her go or will he try to selfishly stop the clock?
Aka an Undertale/Alice By Heart crossover fic because I couldn't find one
Note: knowledge of Alice By Heart isn't needed to read this fic!
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A kid falls underground and they are DETERMINED to do the fastest pacifist speedrun ever, this of course becomes a problem for the narrator
- Language:
- English
- Words:
- 3,619
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 15
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Life in Hometown had always been quite; the small, sleepy, rural community had little to offer. For Ralsei Dremmurr, this feeling was compounded by a list of tragedies in his youth and years of being bullied. But when a spur-of-the-moment decision by his homeroom teacher throws Ralsei and Lancer, one of Ralsei's bullies, into another world, his life finally speeds up; for better or worse. Now expected to work with Lancer, Save the world, help several new friends with their problems, help his old friends with their problems, and more, Ralsei's got his work cut out for him.
A roleswap AU of Deltarune, where Ralsei/Kris trade places, Lancer/Susie trade places, Noelle/Berdly trade places, and many Darkners rotate around.Series
- Part 1 of Shattered Mirror
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You’re not supposed to be in the Dark World, but you are. This television is not supposed to be depressed, but he is. You’re not supposed to empathise with inanimate objects, but all you want to do is make his suffering go away.
Azzy’s school friend Y/N meets Tenna. Both realise that they share abandonment issues and bond over it. Romantic tension ensues. Expectations are irrelevant.
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Waking up buried in snow, alone, and with no memories but basic common sense?
Check.
Seeing numbers, words, and broken code floating around every object and surface?
Also check.
Looking like a walking system crash—with one eye red, the other computer-blue, and a body flickering like corrupted a light?
Triple check.He doesn’t know who he is.
He doesn’t know what happened.
And most importantly...
He doesn’t know why everything feels like he shouldn't be alive.Everywhere he looks, the world speaks in code—and he can read it like instinct. Names, stats, system files, broken timelines. And yet, the more he tries to remember, the more he feels like a mistake.
Note from the Me:
This is my take on Fatal Error—a much more none canon, wandering version of him. He’s not fully canon-compliant inn terms of power and has a different origin and personality. It’s a reimagining: glitchy, lonely, and filled with questions, bad puns, power and some more bad puns. -
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"Traumatized people chronically feel unsafe inside their bodies: the past is alive in the form of gnawing interior discomfort."
-The Body Keeps The Score, Bessel van der Kolk
Dr. W.D. Gaster is not a happy man...but he had been, once. Perhaps he could be again.
...and he can't stop thinking about you. Can't make himself stop thinking about you.
A story in which love, quite literally, saves the world.
(Now in Arc 2)
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Tomorrow would be wonderful, too.
The flowers listen. Asgore doesn't.
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A few weeks after the events of Chapter 2, Susie and Kris had the idea to start up a garage band. While mostly only doing covers, they have about 3 originals.
Members of the band:
Kris: Lead Guitarist, Backing VocalsSusie: Drummer
Catti: Bassist, Vocals
Jockington: Sound check person (Only joined the band because Catti joined it)
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Don't bear the weight of the world alone by SkyWatcher3
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
28 Jun 2025
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After her fight with Clover in New Home, Ceroba, in the middle of rethinking her entire life, chooses to save one child's life, and the consequences of her decision changes the fate of the entire Underground forever.
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Just some of my personal headcanons for some characters and ships!
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Twin Runes by Thealmoghtbeyonder2099
Fandoms: Undertale (Video Game), Deltarune (Video Game)
28 Jun 2025
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Summary
Twin Runes es un AU cómico en su mayoritariamente alegre centrado en los universos Deltarune y Undertale. Una fuerza desconocida ha provocado que aparezca un punto de conexión entre los dos universos, lo que hace que Frisk y la molestia fantasmal Chara tropiecen en la vida de Kris en uno de sus muchos reinicios (para gran disgusto de Kris). Se produce un caos que rompe el juego.
La traducciones del "los pájaros y abejas" hasta el "No sirve pa' nada" no son mías. Del resto de traducciones si son de mi autoría
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Basil Whitmore speaks through flowers, crafting bouquets that express emotions words cannot. When Sans and Papyrus walk into his shop, Basil finds himself drawn to the quiet skeleton with tired eyes and an unreadable smile.
Basil knows the language of flowers, an important language to him.
Now, it’s up to Sans to decide what to do with the words hidden in petals.
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What happened to December Holiday? 15 year old deer-girl, brunette, short wavy hair, usually wears a red jacket, went missing in April of 2012.
This fanfic (for now) will tell the events that previously happened before she got lost in Angel knows where.(Mainly a DESSRIEL fic but I'd like to focus on other characters and make a more profound plot as well :pppp )
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So you got woken up in the middle of the night by your new neighbors... no biggie! You're sure they're just excited to be in a new (cheap) apartment. So you decide to introduce yourself to them when they get settled in.
But to your surprise, your new neighbor just so happens to be a skeleton!
"Oh!" You say, surprised by your neighbor's appearance, "Uh hey! Welcome to the unit, I'm your neighbor"
"oh! hey i'm sans" He smiles, lazily copying your initial reaction.You hold your hand out to shake, he looks at your hand for a moment before accepting it.
when all of a sudden...
PPPPPPRRRT!
Was that a... whoopie cushion in his hand?
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Just as Kris and Susie define their relationship, a church trip for a choral competition threatens to have it all falling apart. At the same time, Noelle has a series of realizations about herself, the world, and the stupid crushes she’s been trying not to let grow wings.
Series
- Part 2 of Dog Days
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The dichotomy between black and white is your constant when it's time for you to meet the whole new civilization Frisk brought along with them to the Surface.
As a parent, it's not easy to trust others when they've hurt your child.
So when that new civilization decides they owe Frisk both for saving their kind and for still hurting them during that process, you've got plenty to say to them.
Forgive as easily as you once did with others during a stage of naivety? Oh, hell no.
They better have a good reason for hurting your child and an even better one for wanting to be a part of their family.
• • •
Full Arc List:
Arc 1 | Ruins
Chapters 1 to 15 (✓ complete)
Arc 2 | Enemy Approaching
Chapters 16 to 25 (× current)
Arc 3 | Pathetic House
Chapters 26 to 30
Arc 4 | Spear of Justice
Chapters 31 to 40
Arc 5 | Here We Are
Chapters 41 to 50
Arc 5.5 | Good Night
Chapters 51 to 55
• • •
(Important Notice: If this work seems familiar, it was originally published in 2020, but was deleted due to various health issues!)
(OLD WRITING LASTS UNTIL CHAPTER 25.)