Undertalecrossover Stories

Harry Potter was master of death, he was use to ending in other universes/timelines. This time he ended up as a skeleton monster Remake of Death and wingdings om ao3 201...

Life itself is unfair. People are lost in the blissful deception, believing everyone is treated the same. But there are those who got it worse, Sans learned that the har...

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...

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...

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 After The Events Of Undertale (Pacifist Route) This Being Released From His Primary Objective And Being Freed From The Destiny Written By His Creator This Feels A V...

Undertale x Ninjago This is not my original idea, it was a one shot, that is on fanfic.net. It is under the same name. There's a lot Nya didn't tell the ninja about wh...

When Lightning and Mater fall down in the underground, they must find a way to get out safely. Along the way meeting new monster friends and a familiar face... Mater's U...

This is a crossover between Percy Jackson and Undertale After a genocide route, Sans is somehow not dead, and Chara has broken the barrier and mysteriously disappeared...

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...

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...

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...

Art ain't mine.I only used it to make le cover.Countryhumans highschool, elemantary and kindergarten au all mashup together cos why not?Other than that this was mosty ma...

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...

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

Yep, I've gotten into UnderTale a bit. Here ya go

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...

One camping trip gone wrong and here they are. Who would've thought that Mt. Ebott is actually in Michigan and it so happens to be in Grand Venture State Park with the g...

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...

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