1 - 20 of 11,555 Works in Alphys (Undertale)
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This is about Alphys and the True Lab, except instead of entries, she writes in a diary. And with added guilt! All of this is based on lore, so please read if you already know the lore of undertale. (i know this is a terrible summary throw stuff at me all you want)
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Soul's Delight by novarechive
Fandoms: Undertale (Video Game), Alternate Universe - Underswap (Undertale) - Fandom
16 Feb 2026
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At the age of 10, you didn’t expect your dreams to be confirmed with your soulmate tattoo.
‘WHAT’S THE SWEETEST THING YOU HAVE?’
Neither did you expect that the sweetest thing you'd ever get to have would be your future.
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Between the Monsters and Me: They Call Me Caro by Feeley
Fandoms: Undertale (Video Game)
16 Feb 2026
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Two years after the monsters reached the Surface, life is slowly returning to normal, with its routines, unexpected events, and surprises. Caro discovers that friendship, chaos, and curiosity intertwine, and that a certain ambitious skeleton can make every day... delightfully complicated.
- Language:
- English
- Words:
- 2,507
- Chapters:
- 1/1
- Hits:
- 1
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On Valentine's Day, Susie notices that Kris and Noelle are missing class and get suspicious.
Or
Kris and Noelle are scheming and Susie investigates.
- Language:
- English
- Words:
- 2,529
- Chapters:
- 1/1
- Kudos:
- 3
- Hits:
- 50
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What would you do if you woke up in a completely unfamiliar place, forced to dance to the tune of a strange scientist? It's not an easy question, but it's one that a group of skeletons—Color, Geno, and Error—will have to answer. The story follows their adventure in a new alternate universe, fraught with many secrets and intrigues. Will the heroes be able to escape their enemies' clutches, or will they only complicate matters by attracting even more Sanses?
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Frisk’s dad Sans and uncle Papyrus are royal guards. That’s pretty much all Frisk knows about their jobs. Frisk doesn’t know much about their past nor what they actually do for work. All they know, is that they have to wear their monster disguise every day or they’ll be caught. They know that humans who are caught in the underground die. But what happens when Frisk slips up and accidentally alerts the whole of the underground to their presence?
Sans is struggling hard trying to balance being a parent and his job. He wants to be around for Frisk, but he has to satiate Asgore lest he find out Sans’s secret.
Papyrus really wants what’s best for his family. He’s worried about Sans and how stressed out he’s been. Sometimes he worries that Frisk doesn’t have enough social interaction.
I’m so excited about this, I’ve been working on this project for 3 years at this point and I’m so so so happy I’m finally able to post it. It’s still a work in progress, but it’s going well so far! Constrictive criticism is appreciated, especially if you catch a spelling error of mine (just be nice about it please).
- Language:
- English
- Words:
- 3,392
- Chapters:
- 2/?
- Hits:
- 6
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Chara wakes up in a bed of golden flowers.
She wiped out the Underground. She doesn’t remember doing so. Frisk stays by her side.
Everyone else already knows. They are kinder than they should be. She wants mercy this time. There are no resets left.Dead Dove: Do Not Eat.
- Language:
- English
- Words:
- 1,092
- Chapters:
- 1/8
- Kudos:
- 1
- Hits:
- 17
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Papyrus and his Detective partner (you) have to solve a missing persons case. It turns into a huge undercover operation where you still have to rescue the missing person: Sans!
Along the way there's shenanigans, swearing, sex, misunderstandings, bad puns, and you fall in love with your spiky partner's brother. -
Redemption and Revolution by thevideogameempire
Fandoms: Undertale (Video Game), Undertale Yellow
16 Feb 2026
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It’s done, after all these years, monster kind can finally be free of their prison in the underground. But not all is well. A specter from the past haunts Frisk, and only by learning to move on from the past that never was can they both find peace. Meanwhile, another specter haunts the world. A war is brewing once again between the ways of old, and the way of the future. Dreams of world revolution and a classless society reignite, and soon the world will be divided between those who wish for a brighter future, and those who cling desperately to their own past that never was. Soon, the recently emerged monsters will need to choose what role they will play in this conflict, and what their place will be in the world.
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Corporate Fallout Vol. 1 Chapter. 1 "Weakest of Today" by EsperSystem
Fandoms: Undertale (Video Game), Original Work
16 Feb 2026
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Quietly, the world came to an end.
Monsters changed. Humans became inflexible. Souls started to shatter.The Angel is regarded as the Strongest of History in a post-nuclear wasteland where emotion determines reality and one's SOUL strength determines their level of power. Undyne is today's strongest. And a red SOUL awakens somewhere beneath it all.
Frisk had no desire to serve as a weapon.
Regretfully, the world has already made up its mind.Series
- Part 1 of Undertale: Corporate Fallout
- Language:
- English
- Words:
- 3,579
- Chapters:
- 1/1
- Kudos:
- 1
- Hits:
- 16
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Justice Evolved by The_Spar1an
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game), Undertale Red & Yellow (Video Game)
16 Feb 2026
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Summary
Clover remembers.
After spending quite some time dead, He finds himself with memories he'd rather not have.
Memories that tell him who he truly is.
Memories that haunt him.
edit: lowkey put me on the stuff I was on when I wrote this summary.
Anyway, basically Clover remembers resets, especially genocides. So he basically remembers how to use his powers from previous runs as well, and then la tee doo dee dum, and bam. Justice Evolved.
If you're curious enough to have questions, maybe read the fic. It'll boost my ego. (please)
(edit 2) Disclaimer: if you want to read for cocoapowder, cocoapowder chapters will be released at a later date. As of this edit, the relationship between Clover and Chara has yet to be explored.
(edit 3) despite "Teen and up Audiences" rating, please note that It's catered more towards 14+ ages.
------------------------------This work will contain Original characters for the sake of worldbuilding, which WILL play major roles in the story.
This is an alternate universe to Undertale Red and Yellow.
This work will be from Clover's POV. (written in first person, not second person, aka "I" instead of "You") -
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Summary
Reader and Sans are exes forced to live in the same house during the holidays. You both have some issues to work through.
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“i would get them myself, but my hands are tide.”
He puts his hands out as if they were bound by handcuffs. A beat. “like the laundry detergent.”
“Oh brotherrr.”
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After watching the eighth human RESET their genocide route ad nauseam, a lone scientist decides to pull in another human, far from their reality, to put an end to the tale. At least, hopefully one other human will be determined enough to stop them.
DoubleLight is based on DoubleTale: Rewritten by XWolf26 on Fanfiction.net.
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Tails and Alphys love story by RisingTails
Fandoms: Sonic the Hedgehog - All Media Types, Undertale (Video Game)
15 Feb 2026
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Tails and Alphys start to notice something between them
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As you walked you failed to hear the screams of terror of a bus going over 100 miles per hour and the sounds of it starting to bust down- it speeds near the sidewalk—the people in it shriek. Their blood curling screams didn’t occur to you, your headphone quality being way too good. Your shoulders relaxed as you stretched your limbs; very much unaware of the danger and pain that would very much make your life way more miserable. You should move out the way. But- likewise, you are unaware. Of death flickering and time excited to cut your strings.
The bus is almost out of energy- and has been stopped.
Or so people thought.
It began to tilt- right where you were very much slowly walking. Andddddddddd—
It didn’t crush you to death.
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"Entre les monstres et moi : On m’appelle Caro" by Feeley
Fandoms: Undertale (Video Game)
15 Feb 2026
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Summary
Deux ans après que les monstres ont rejoint la Surface, la vie reprend doucement, avec ses routines, ses imprévus et ses surprises. Caro découvre que l’amitié, le chaos et la curiosité se mêlent, et qu’un certain squelette ambitieux peut rendre chaque journée… délicieusement compliquée.
- Language:
- Français
- Words:
- 2,693
- Chapters:
- 1/1
- Hits:
- 6
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The Autumnal Equinox by TheHourglassForest (HourglassForest)
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
15 Feb 2026
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Summary
For Kanako and Clover, Dune Hill was the place to be. And after both going through many scary encounters during their short time on the surface, it was nice to have a place to call home. Free from whatever was happening in the rest of the region.
However, not all is well. And soon, they're going to find themselves in the middle of something worse than anything they've been through. Something that will test the strength of their friendship, and will have them both be asking themselves so many questions.
Because when your opponent has nothing to lose, everything can change on a dime.This is the second fic in the series, with the story continuing right where the first fic ends. If you haven't read the first one through, I recommend giving it a read since there's a lot of lore that gets carried over. (provided that I don't accidentally retcon everything since it's almost been two years since I started the series)
Series
- Part 2 of The Forest Beyond
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Summary
29 days of short stories based on the Febuwhump 2026 prompts, written every day, on the day. Chapter Index inside with Prompts, Summaries, Major Characters & Warnings for each day
DAY 15: Test Subject
Alphys & The Amalgamates
She thought they were dead. She thought there was no way she could hurt them. She was wrong. -
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Summary
Meet Grace a young bar owner with secret she holds tight but what happens when she meets a certain skeleton monster with a big 'family' Will her secrets stay hidden or will the world know.
(I am bad at tagging sorry.)
All the aus here are undertale, underfell, underswap, Swapfell purple, Swapfell red, Fellswap gold, Mafiatale, Mafiafell, Mafiaswap, the gaster brothers, horrortale lusttale, and lustfell. -
UDY on the Surface by CommanderBullet
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
15 Feb 2026
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Summary
It's been a few years since Monsters returned to the Surface and lots of things have changed... Accompany your favorite characters from Undertale, Undertale Yellow and Deltarune as they try to manage their everyday responsibilities and go through a few wacky adventures while at it in this slice-of-life crossover AU.