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The Doctor's Descent by Feanyx1
Fandoms: Undertale (Video Game), Doctor Who (2005), Deltarune (Video Game), Doctor Who
22 Nov 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 a 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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Frayed Strings and Broken Promises. by TheHourglassForest (HourglassForest)
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
20 Nov 2025
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Summary
A life cut short,
sometimes can be a life worth saving.But is the effort required in doing so worth it?
And if done, what would be the cost?
There's no such thing as a deal that is too good to be true.And yet, some don't heed the warning.
This will cause devastating effects later on.
It's up to Clover and their friends to figure out how to deal with this situation.Series
- Part 1 of The Forest Beyond
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Another Phantom / Act 1: Intwined by CrumbleKoek
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
18 Nov 2025
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Summary
In a timeline where things kept being slightly off, the first drastic change happens when Ceroba succesfully gets to Hotland with Clover.
However, the consequences of this action slowly become evident, as things don't go as anyone involved could have planned.
Series
- Part 1 of Another Phantom
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A Former Royal Scientist’s Research of the Space Time Continuum by stitchthelilo
Fandoms: Undertale (Video Game)
18 Nov 2025
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Summary
A little bit of rest during her research could definitely hurt, yet her eyes began to shut anyway. The consequences to this were much more dire than Queen Alphys could’ve ever expected, and after an abnormal earthquake she finds herself stuck within the endless Multiverse.
And for some reason Sans is.. everywhere??
OR
Takes place right after the Alphys Neutral Ending, where a freak accident sends Queen Alphys - better yet, just Queen - out on a travel through the Multiverse.
Series
- Part 2 of Longfics
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Undertale Yellow: Defiant Hope by Kanakoke_K9907
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
16 Nov 2025
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Summary
This is my fanfic Undertale Yellow: Defiant Hope, My own take on the world of the Underground. This is the first story I've ever written so it may not be the best, but I do hope you enjoy.
Special thanks to An_Overly_Curious_Revolver for proofreading my story to make it more engaging and likable.
And SomeoneNotReallyNoteworthy for fixing the grammar mistakes of chapters 1-3, and making it more engaging.(so far only chapters 1-6 have been edited.) -
Frisk Gets Adopted By A Skeleton (UnderAdoption/AdoptionTale) by Cat_On_A_Keyboard, CheerfulForest
Fandoms: Undertale (Video Game)
15 Nov 2025
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Summary
Sans lives alone with his baby brother in an old house on the outskirts of New Home. He raises him to the best of his abilities. One day, he hears the doorbell ring. He opens it and finds an abandoned child. A human child. He has no idea how they got there. The only thing left with the child was a note. Sans reads the note and learns the orphan's name. Frisk.
Series
- Part 1 of Frisk Raised In The Underground
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Child Of The Sun by GamerXZ
Fandoms: Undertale (Video Game), Fangame - Fandom, Undertale Yellow (Master Sword Video Game)
13 Nov 2025
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Summary
Clover had done everything he’d set out to do. He had found out what became of the Fallen Children, helped his new friends resolve their issues, or at least put them on the road to doing so, and now all that was left to do was to finish his journey…and face the destiny that awaited him at the end of the road he had chosen.
But what if, instead of immediately hopping right to giving up his soul, he took the time to stop and weigh all his options? Along with the pros and cons of each? And in doing so, what if he realised there was still one more loose end to tie up? Perhaps even one more soul that needed saving?
It's not like this one deviation from the script will change all that much, right?
….Right?
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Summary
Axetale preservation and short stories to keep this universe alive if anyone has any requests please leave prompts. Most of these are concepts made by myself, but other Au’s besides the ones listed above in the tags will be used.
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Under the mountain of dust and rubble,lays hearts of white and chipped gray by The_ramblings_of_the_insane_writer
Fandoms: Undertale (Video Game)
08 Nov 2025
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Summary
fri-no,the player left
They didn’t even finish the run they were on when they did
They never even made it to the final corridor when they left, simply standing outside it when they loged off,never to return
destruction, dust, and the remains of the underground being the only things left, with no reset in site, but there were still a few stragglers left,,there souls still intact,but the core is starting to break down, oh what oh what are they going to do now?
- Language:
- English
- Words:
- 2,211
- Chapters:
- 1/?
- Hits:
- 10
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The Caretaker by TiredFurry_hmm
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
17 Oct 2025
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Summary
Locked away in the lab, Kanako becomes something unrecognizable in both body and mind, turning cold and aggressive. Facing her fears and learning of the true nature of her companions, she becomes a guardian for the amalgamations Alphys barely considers alive. Having no hope for herself, the caretaker of the lab forces the depressed royal scientist to come to terms with just how alive they really are, and how desperate her friends are to go home.
Series
- Part 1 of TiredFurry's UT/UTY Post-canon
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don't ask a lot, and you won't lose a lot by anonymousyellowlizard for alphys_knight_theory
Fandoms: Undertale (Video Game)
08 Oct 2025
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Summary
“Ha!” the laugh is so wrong, it grates on her. “My time is over, miss. And things that happened today… they have shown me how mistaken I was in my thinking, even in my heyday.”
Everyone is losing hope. Even hardy ol’ Gerson. Alphys deflates at that.
“Besides,” he goes on, “There is still someone left – you yourself Dr Alphys.”
“I’m not –”
“Ye’r the last remnant of the royal axis, young lady,” his eyes glint. Her heart aches for Undyne again. “Them good folks downstairs… They’re gonna look up to you. It’s all up to you now, kid.”
After the human leaves a grieving kingdom behind, Alphys is newly elected Queen. Even as she leads the remainder of monsterkind through these difficult times she has no space to mourn for what she lost.
She doesn’t know that an old friend she had thought dead will return to her.
Series
- Part 9 of Kink/Whumptober 2025
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Feisty Squirrel and her new Mamadila? by Narcias
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
20 Sep 2025
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Summary
This is a Mooch and Dina focused fic for any big fans of the two. Many sad, happy, angry and whatever other emotions that exist shall be in play. A fic post pacifist ending a little bit of time after.
(Mooch is around 14 or so in this fic for my story. Personally though i think she's just at an age right UNDER 21 and that's why she's not allowed a Adult soda in the game. ;p) -
Undertale: What Honesty Feels Like by Virtue_Of_Dragons_Dreamer
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
16 Sep 2025
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Summary
This story is set in an Alternate Timeline that branches off before the events of Undertale. Sitting in the True Lab, Alphys gets an unexpected phone call from Undyne. When confronted by the captain about her secrets, Alphys chooses to be brave and tell Undyne everything. But honesty doesn’t mean the road ahead will be easy. Can she hold onto that Bravery when her attempts to fix her mistakes unleash something horrible?
Series
- Part 1 of Virtue’s Underverse Stories
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Worth A [Shot] by Grand_Spurinko
Fandoms: Deltarune (Video Game), Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
11 Sep 2025
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Summary
Clover is torn between his duty and his chance at a better life.
Flowey must figure out why his RESET button isn't working.
Martlet, Ceroba, and Starlo have to figure out how to care for Clover.
Above all, Spamton G. Spamton must figure out how in the [All Expenses Paid Vacation] he got here... and maybe make some [Deals] along the way.
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How to Embrace Your Newfound Freedom: A Comprehensive Guide by BitchReaders24
Fandoms: Hazbin Hotel (Cartoon), Undertale (Video Game)
03 Sep 2025
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Summary
Angel Dust's contract with Val has FINALLY been broken, and now the spider is enjoying his new life as a free spider...right? He doesn't have to put up with Val's shit anymore. No more being told where to go, what to do, how to act. No more long nights at the studio. No more abuse. Angel should be ecstatic that he's no longer on a leash, so...why does he feel so empty?
Join Angel Dust as he navigates through his new life without Val, and the brand new friends he makes along the way.
- Language:
- English
- Words:
- 1,382
- Chapters:
- 1/?
- Kudos:
- 2
- Hits:
- 93
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Confidential Pokédex: Amalgamation by LuckyStar190
Fandoms: Pocket Monsters | Pokemon - All Media Types, Undertale (Video Game)
29 Aug 2025
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Summary
Break into Dex entries the Professors of Paldea kept from you. Entries listing failed experiments too dangerous to ever show.
(based on the Amalgamates, a monster type from Undertale) -
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Summary
Alphys releases the Amalgamates with the help of Undyne. How will everyone react?
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Summary
When Rosie finds herself in the Underground she's quick to adjust inspite of the depression that follows. But, Sans believes she's here for a reason and is connected to the mysterious Doctor Gaster. Will an adult human change the tides and help Frisk free the Underground entirely or will it cause more heart ache?
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Justice is filled with kindness by banana_hater
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
08 Jul 2025
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Summary
Clover got tired of life and he crouched down in a hole.