Awesome Undertale stuff
20 stories
Timelines (A Doctor Who/Undertale crossover) by introverted-actress
introverted-actress
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What happens when a human gets tired of resets? When the thrill of a genocide route becomes boring and mundane? This is exactly what happens to Frisk. They spent so much time going through reset after reset that now they are growing tired of it. However, little do they know that their next timeline will be one of the most interesting they've ever had. When Frisk resets after an incomplete genocide, it captures the attention of a certain alien Timelord called The Doctor. He has to travel between dimensions to investigate this strange anomaly, but ends up with an adventure much more strange than he had initially anticipated. This timeline is breaking. The entire reality is being torn apart and it's up to Frisk, Sans, and The Doctor to stop it. (Disclaimer: I do not own Doctor Who or Undertale. The only thing I own is the plot line and the writing.) Cover art by @GodOfChaos3900
When All Else Fails (A ZanaTale Oneshot) by ZanaBSparrows
ZanaBSparrows
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I wonder... In a timeline where Chara has never succeeded... Just what exactly goes on in the Judgement Hall? Sans has never died. ... Or has he?
My Greatest Experiment (Skelebros' Origin Story) by ZanaBSparrows
ZanaBSparrows
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    Parts 29
After much research and theorizing, I've decided that I'm going to attempt it. It's risky, but I'm so desperate at this point that I'm willing to put my own well being on the line. If I survive, this may just turn out to be very... interesting. This is my thoughts on the origins of Sans and Papyrus, as well as their connection to Gaster. It will be connected to the ZanaTale timeline (or, in otherwords, my Sans x Reader fanfic "When Two Souls Meet"). Loosely inspired by the HandPlates AU by Zarla. Awesome cover image by Dweebycake.
When Two Fates Intertwine (Sans x Reader) by ZanaBSparrows
ZanaBSparrows
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    Parts 14
[THIS IS A SEQUEL TO MY OTHER FANFIC "WHEN TWO SOULS MEET!" If you haven't read it, I would highly suggest it--the story won't make much sense otherwise.] Sans has finally found someone he can trust--Frisk's sister, the eighth fallen human. After months of step-siding and awkward interactions, the two are finally a couple. Things are slowly falling into place--there are no more resets, and Chara and Flowey have been a lot more quiet in the last few months. But things can't stay this way... can they? Note: The story was put on hiatus early on, and updates are now very sporadic. Despite that, it's still a labor of love!
(Sans x Reader) When Two Souls Meet by ZanaBSparrows
ZanaBSparrows
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    Parts 28
Sans has lived through countless timelines. He's seen the kid make friends with everyone, only to give up in the final moments. He's seen the kid killed, over and over and over again. Sometimes, he'd even done the killing himself. And no one ever remembers. Not even the kid herself. It's an exhausting cycle, one that never seems to end. But there's something different about this run. Another human's fallen down... the kid's sister.
Undertale Shorts by ANinnyMouse42
ANinnyMouse42
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A bunch of Undertale short stories! ... Which, despite the cover, are not only about Frisk, Flowey, Alphys, and Sans. There are other characters in there too. Aww, who'm I kidding? Probably 90% of this is skelefam fluff 'n' feels.
Broken Timelines ✔️ by Meepaa
Meepaa
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    Parts 106
I WROTE THIS WHEN I WAS 15/16 I'M REALLY SORRY LADS Chara is stuck in a spiral of Evil. Sans and Frisk are happily living on the Surface. The LOVE is gone, and replaced with love. All Gaster needs to do is interfere with a moment.
From War to Science {UNDERTALE} by emotistic-optimistic
emotistic-optimistic
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Is it still considered a backstory if the protagonist doesn't exist? Companion story to "Reset".
UnderCorrupt by ANinnyMouse42
ANinnyMouse42
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I have an Idea for an Undertale AU. And apparently, it's a good idea? So here, have a book. --- Long ago, two races ruled the earth. But when a plague of corruption swept through one species, causing a half of their population to attack the humans, the humans thought it safer to banish all the monsters underground. Now, the Underground is a Battleground. The battleground of the Pure and Corrupt armies. This Is UnderCorrupt. -- COMPLETED!
Reset {UNDERTALE} by emotistic-optimistic
emotistic-optimistic
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*FEATURED STORY* As Judge for King Asgore Dreemurr, Sans has seen a lot of strange stuff. But when he wakes up with the feeling that something is completely wrong, he decides it's time to investigate with the only monster who could know what was happening: Royal Scientist W.D. Gaster.