Undertalecrossover Stories

At a genocide run Sans unexpectedly wins against ¿Chara? and something strange occurred, the timeline was thrown into chaos. As a result of this chaos, Sans unknowingly...

Sans was sick of the endless resets that haunt his world, knowing full well that is the player's fault. As repeating cycle continues something odd happens at yet another...

Remember when Chara killed Sans? What happened if instead of him dying, Gaster pulled him into a different dimension and was able to heal them with a healing pink founta...

Hi 👋🏻! I'm Bea. This is my crazy story about my friends, who are known as the CreepyPastas. I have a few other friends besides them, buuut let's focus on the CreepyPas...

non of the characters (except for one) belong to me and all belong to toby fox and the people who worked on undertale, relogic, and the calamity mod team

A story on how Half-Life meets Undertale...

Instead of going to Gravity Falls, the twins go to a city that awaits them. Thanks to Grunkle Ford and Stan, they are staying at a palace. Palace?! You ask? Yes, I said...

This is a rewrite of my 1st ever book, "Judgment of the Demigods: Demigod Karma" So... somethings are gonna be different, and I HOPE my writing style is signif...

♡ : 𝘯𝘢𝘵𝘴𝘶𝘬𝘢𝘴𝘩𝘪𝘪 - 𝘢 𝘸𝘰𝘳𝘥 𝘶𝘴𝘦𝘥 𝘸𝘩𝘦𝘯 𝘴𝘰𝘮𝘦𝘵𝘩𝘪𝘯𝘨 𝘦𝘷𝘰𝘬𝘦𝘴 𝘢 𝘧𝘰𝘯𝘥 𝘮𝘦𝘮𝘰𝘳𝘺 𝘧𝘳𝘰𝘮 𝘺𝘰𝘶𝘳 𝘱𝘢𝘴𝘵. ... 𝘣𝘶𝘵 𝘯𝘢𝘵𝘴𝘶...

The original Mystery Twins wander Glass Shard Beach on a daily basis, looking for adventure. They weren't expecting to actually find something. When their voyage goes d...

Book cover created by @Krystal_GlitchGirl A collab book series with @Krystal_GlitchGirl This book series will be about the aphmau smp meeting different fandoms, I'll be...

I got the idea to wright a Undertale Five Nights At Freddy's crossover after remembering that I've only ever seen one. Also please go give love to my friend @Luna_the_si...

Seconds before disaster, and the end of all AUs, Ink managed to grab the Perseverance Vial. Quickly, before his enemies managed to snatch it from him again, he unleashed...

I started this while bored during the FSA, and my friends wanted me to upload it. I know it's cringy, I don't really care, lord help him.

Everything sure has changed for the better, not only has all the gems been uncorrupted and the war with the diamond authority has been dismissed but now, all monsterkind...

A little undertale/ Steven universe crossover I made. This is about my past, when peridot, Jasper, and me lived all in the same world. I hope you like it!

So I watch X-Tale on YouTube and it got me inspired. So here What has happened? What did he do? Deku wakes up next to his hero version who knows everything, and tries to...

While exploring Mount Ebott(which was one of the mountains that surrounded Gravity Falls), the Mystery Twins Dipper and Mabel accidentally fell into a huge pit, which le...

Here is all the stuff for my new Undertale & Deltarune AUS, Mixeltale & Taxlimel (which is an anagram of Mixeltale). I do not own Mixels, Undertale, or Deltarune in any...