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The Doctor's Descent by Feanyx1
Fandoms: Undertale (Video Game), Doctor Who (2005), Deltarune (Video Game), Doctor Who
09 Sep 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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Bookmark Notes:
No sé mucho de doctor who pero,,, yeah suena a que va a ser un buen crossover :p
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Child Of The Sun by GamerXZ
Fandoms: Undertale (Video Game), Fangame - Fandom, Undertale Yellow (Master Sword Video Game)
10 Jun 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?
- Language:
- English
- Words:
- 297,333
- Chapters:
- 12/?
- Comments:
- 259
- Kudos:
- 682
- Bookmarks:
- 103
- Hits:
- 31,429
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Summary
It wasn't Floweys first Timeline like this and is probably not his last either. But something didn't feel right.
Something was of.
...
Next round he will try something new.
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Bookmark Notes:
This is amazing! Flowey is such a scumbag! I love it! Flowey killing the whole underground through emotional manipulation? Amazing! Though I feel bad for Undyne and Sans :( 10/10 would read again!
Finished.
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Bookmark Notes:
Flowey what are you going to do
Well I can kinda guess from the tags but
What are you going to do
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Summary
(TRUE PACIFIST SPOILERS, OH MY!)
Alphys makes her daily rounds to feed the Amalgamtes in the true lab. It's very quiet in there, so she has a lot of time to think and reflect. She knows she can't escape what she did forever...
Series
- Part 1 of B.P.: Before Pacifism
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Bookmark Notes:
read
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The Trans-Underground Alphys-Carrying, Match-Making Road Trip by Taliax
Fandoms: Undertale (Video Game)
02 Mar 2021
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Summary
From her secret security camera, Alphys gets too invested in Sans's relationship with the voice behind the door. This wouldn't be a problem if Mettaton didn't decide to take her ship into his own hands.
Trying to catch up with a battery-powered robot is hard work, but telling the truth is even harder.
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Summary
You watch them suggest names and argue with each other as you stand there dutifully like a newly-adopted dog. Rus sidles up close to you and looms over you like a hanging specter. His smile does not look friendly.
“How about..Snowy,” He suggests, his grin widening at the twitching grimace on your face.
How to survive a blizzard and nonconsensual teleportation to a dilapidated sci-fi basement.
- Language:
- English
- Words:
- 200,655
- Chapters:
- 11/?
- Comments:
- 292
- Kudos:
- 920
- Bookmarks:
- 249
- Hits:
- 20,758
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Bookmark Notes:
Chapter 11
Snowy undertale you will always be famous... They're real to ME!!!!!!!!!!!! -
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Worth A [Shot] by Grand_Spurinko
Fandoms: Deltarune (Video Game), Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
05 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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Bookmark Notes:
first uty fic ive read in awhile and its pretty cool
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Summary
Alphys accidentally pulls an interdimensional traveler beyond time and space into her lab.
...He's kinda hot.
- Language:
- English
- Words:
- 7,795
- Chapters:
- 3/3
- Collections:
- 1
- Comments:
- 22
- Kudos:
- 91
- Bookmarks:
- 8
- Hits:
- 822
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Bookmark Notes:
ALERT ALERT RARE ALPHYS AS THE MAIN CHARACTER FIC AND IT'S GENUINELY WELL DNE AND SUPER CUTE COME REAAAAAAD
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Bookmark Notes:
wow. Interesting concept
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Bookmark Notes:
Wow well-written.
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A Former Royal Scientist’s Research of the Space Time Continuum by stitchthelilo
Fandoms: Undertale (Video Game)
03 Sep 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, and a freak accident sends Queen Alphys out on a travel through the Multiverse.
Series
- Part 2 of longfics
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Bookmark Notes:
A Former Royal Scientist’s Research of the Space Time Continuum
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Bookmark Notes:
1，很有意思的开头！al女王在时空穿越的过程中发现sans总是在那
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Summary
Neutral ending time, folks! Queen Toriel has returned to rule, but things are never smooth for a new ruler, especially when times are grim. Conflicting ideologies threaten to tear apart the Underground... and at the heart of it sits the royal scientist, staggering under the weight of her secrets.
Things may go in unexpected directions, so if you want to enjoy this story to the fullest, I suggest not reading the tags.
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Summary
When Frisk finished her story, barrier broken and monsters freed, she knew there was still a loose end, but she never expected everything to come unraveled before her eyes. Determined to save the only family she’s ever known, Frisk must stitch their lives back together after they are ripped apart at the seams and then attempt the impossible to stop it from ever happening again.
[A story like this has been told before, in many different ways by many different people. Even so, I hope you enjoy it. Please know all major canon timelines and the music of Undertale before reading for the best experience.]
[An AU of what happens after a specific time kid's True Pacifist ending.]
Series
- Part 1 of PATCHWORK SOUL Series
- Language:
- English
- Words:
- 733,921
- Chapters:
- 85/85
- Collections:
- 1
- Comments:
- 490
- Kudos:
- 853
- Bookmarks:
- 115
- Hits:
- 48,708
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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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Frisk Raised In The Underground by Cat_On_A_Keyboard, CheerfulForest
Fandom: Undertale (Video Game)
19 Jun 2024
- Words:
- 42,902
- Works:
- 2
- Bookmarks:
- 5
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Bookmark Collections:
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Frayed Strings and Broken Promises. by TheHourglassForest (HourglassForest)
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
09 Sep 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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Bookmark Notes:
look really well written but then a thing happened in chapter 17 so i am probably not gonna follow it anymore
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Bookmark Notes:
Ch 9
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Summary
“Have you ever thought of a world where everything is exactly the same... Except you don’t exist? Everything functions perfectly without you.”
Alphys spent a lot of time thinking about what it’d be like to start over. It wasn’t fair for someone like her to escape consequences. She knew that, yet the thought never left her mind—the thought that maybe, just maybe, she could get another chance; that she could abandon her life, her failures—everything—and start anew. But that would never happen. Sometimes, Alphys wondered. Would the world be better off without her?
When unexplainable anomalies appear and begin to warp the world around her, Alphys discovers something she was never meant to know: the identity of the former Royal Scientist, and how he met his demise. Doctor W.D. Gaster vanished without a trace; he was erased from reality after an experiment ended in disgrace. Forgotten by the world, shattered across time and space—it’s like he never existed in the first place.
And Alphys can’t imagine a better fate.
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Summary
You cannot use someone else’s fire; you can only use your own. And in order to do that, you must first be willing to believe you have it.
- Audre LordeOr: Snapshots from a world where Chara and Asriel lived.
- Words:
- 305,420
- Works:
- 11
- Bookmarks:
- 262
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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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Bookmark Notes:
Axetale AU lore and facts - you wanna know about the AU? Here ya go!
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Consequences of My Actions (On Hiatus Till I remember how to write) by SexyLinoleum
Fandoms: Undertale Yellow
16 May 2025
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Summary
The one where Ceroba succeeds in taking Clovers soul, and Flowey doesn't undo it.
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The Last Thing I Wanted Was Eight Skeletons [Being Rewritten] by goregutt
Fandoms: Undertale (Video Game)
26 Mar 2025
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Summary
It has been 5 years since monsters were freed from Mt. Ebbot by the human Frisk. Its also been three years since The Anomaly incident of 20XX.
In order to combat the surge of misplaced monsters, and to encourage the unification between humans (and mages) and monsters, an Ebbot based program was launched. LIM, Living in Mutuality Agreement; or its little-known counterpart, Live In Mage Act.
The goal, have mages live with the newly displaced monsters, ensuring peace, and slowly introducing the newly appeared monsters into society.
The catch, your one of them, and no one can know you're a mage.- Language:
- English
- Words:
- 53,403
- Chapters:
- 17/18
- Comments:
- 153
- Kudos:
- 663
- Bookmarks:
- 138
- Hits:
- 12,830
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Bookmark Collections:
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Bookmark Tags:
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Summary
A little while after the events of the original Undertale's True Pacifist run, the monsters have temporarily retreated back into the Underground for whatever reason while Frisk actively refuses Flowey's demands for him to reset the game.
Alphys has plans to create a new anime series, but her plans are interrupted by the fact that Mettaton has broken through the barrier and is trying to take over the entire surface world by amassing a fanbase of every single person on it combined with the fanbase of monsters that he already has.
Therefore, naturally, through a very strange coincidence, Alphys ends up breaking through the barrier and forming a direct alliance with Sans, Papyrus and her lovely girlfriend Undyne in an attempt to stop Mettaton's madness.
- Language:
- English
- Words:
- 24,655
- Chapters:
- 13/13
- Collections:
- 2
- Comments:
- 2
- Kudos:
- 21
- Bookmarks:
- 2
- Hits:
- 911