Undertalecrossover Stories

Sans Undertale goes on wacky misadventures throughout the known multiverse.

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 led them into the underground where the monsters lived and roamed around. Will they be able to make it out alive without hurting anyone? Or will one of them slowly turn into a megalomaniac? ===================================== I DO NOT OWN ANY OF THE CHARACTERS ALL OF THEM RIGHTFULLY BELONG TO ALEX HIRSH/DISNEY AND TOBY FOX

Error and Ink, brothers, are fall into the void in OuterTale. The reason? Nightmare and Dream have turned the whole multiverse against them for their own benefits. Error wakes up in a hospital looking room. He feels squish and soft and sees a girl beside him? "Squid?" "Glitchy?" Error awakened as Apple White, daughter of Snow White! Ink awakened as Raven Queen, daughter of the Evil Queen! How would they live in the world that is filled with 'follow your Destiny' shit. Find out in this crossover, after all, a story always starts at the beginning. Once Upon an ERROR... (inspired by harrish6 and characters may be OOC)

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 doing a miraculous x aphmau and a undertale x aphmau crossover and Krystal will be doing a rainimator x aphmau crossover and a aphmau x my inner demons crossover. This book is the aphmau x undertale crossover book. Aphmau and her friends travel to Mount Ebott and fall down finding themselves in Snowdin, while there they get introduced to different aus thanks to Kitty and Sans but what happens when someone within the aus is looking to steal their souls for his own selfish purposes?

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 downhill, almost quite literally, they find themselves in a new world. What path will they take? Will they try to go home? Will they survive? Gravity Falls/UnderTale crossover Book one: Children Began: August 24th, 2016 Ended: A friend asked me to write a Gravity Falls / UnderTale crossover but she couldn't decide what age to have the original Mystery Twins. So I'm doing it all! (Except Teens) It's going to be a 3 book series so be expecting this. Expect updates every other Tuesday (hopefully)

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 when her body was taken over by darkness. A.K.A Nya gets to meet Gaster, and ends up in the mess that is Undertale. BTW Nya is about 13 here, don't think too hard about ages. And this story mostly takes place after season 6 and before season 7. The fact that it takes place after season 6 is for angst and angst only, because season 6 technically never happened so it's just so Nya angst

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 Undertale is a crossover fanfic between both Undertale and Pixar Cars. If you're looking for an Undertale AU regarding the same premise (Mater's Tall Tale) then don't fret, as I will also be working on that too in the future! I'll be updating this fic whenever I can.

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 CreepyPastas for now, okay? (I am making this as an AU crossover story so none of this is true, okay?! It is for pure fun for me!!! This is something I have had in my head for a while now so it may not be perfect but I will try!!!)

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 geography of the area shifting due to time? Well, now they're lost below the mountain and they're getting out of it, no matter what.

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

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 made for fun, so I would most likely forget about this book in a few days time.

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. Percy and his friends decided to investigate the mysterious explosion site at Mt. Ebott, before Annabeth joins the quest party, she finds a book in a mysterious library that describes the monsters before they were locked in the underground. None of these characters are mine Undertale belongs to Toby Fox Percy Jackson belongs to Rick Riordan This takes place after trials of Apollo so RIP Jason This will probably have made up soul traits and references from other Undertale AUs. All the demigods will have different soul traits, and I will probably make up some soul traits along the way (This might be bad) Maybe Cringe

♡ : 𝘯𝘢𝘵𝘴𝘶𝘬𝘢𝘴𝘩𝘪𝘪 - 𝘢 𝘸𝘰𝘳𝘥 𝘶𝘴𝘦𝘥 𝘸𝘩𝘦𝘯 𝘴𝘰𝘮𝘦𝘵𝘩𝘪𝘯𝘨 𝘦𝘷𝘰𝘬𝘦𝘴 𝘢 𝘧𝘰𝘯𝘥 𝘮𝘦𝘮𝘰𝘳𝘺 𝘧𝘳𝘰𝘮 𝘺𝘰𝘶𝘳 𝘱𝘢𝘴𝘵. ... 𝘣𝘶𝘵 𝘯𝘢𝘵𝘴𝘶𝘬𝘢𝘴𝘩𝘪𝘪 - 𝘸𝘩𝘪𝘤𝘩 𝘥𝘦𝘳𝘪𝘷𝘦𝘴 𝘧𝘳𝘰𝘮 𝘵𝘩𝘦 𝘷𝘦𝘳𝘣 "𝘯𝘢𝘵𝘴𝘶𝘬𝘶", 𝘸𝘩𝘪𝘤𝘩 𝘮𝘦𝘢𝘯𝘴 "𝘵𝘰 𝘬𝘦𝘦𝘱 𝘤𝘭𝘰𝘴𝘦 𝘢𝘯𝘥 𝘣𝘦𝘤𝘰𝘮𝘦 𝘧𝘰𝘯𝘥 𝘰𝘧" - 𝘪𝘯𝘥𝘪𝘤𝘢𝘵𝘦𝘴 𝘫𝘰𝘺 𝘢𝘯𝘥 𝘨𝘳𝘢𝘵𝘪𝘵𝘶𝘥𝘦 𝘧𝘰𝘳 𝘵𝘩𝘦 𝘱𝘢𝘴𝘵 𝘳𝘢𝘵𝘩𝘦𝘳 𝘵𝘩𝘢𝘯 𝘢 𝘥𝘦𝘴𝘪𝘳𝘦 𝘵𝘰 𝘳𝘦𝘵𝘶𝘳𝘯 𝘵𝘰 𝘪𝘵.

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.

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 fountain. Sans doesn't understand how everyone in beach city is okay with him around so he bothers no one and tries to find Gaster. Steven Universe was surprised to see Sans like this, since he visited a memory of Sans being happy and without the red scarf. Will Sans be healed, or broken worse than he already is? Is Papyrus really gone? I don't any of these characters but I do own the plot, enjoy! I will add music.

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 way, shape, or form. Credits to ZootyCutie for the Flipped Sides AU of Mixels & the Messils.

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

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 the glowing bottle. However, instead of finding his old friend infront of him, a bright light blinded him and everyone else in the area, before their consciousness was stolen. Meanwhile, the sun was rising in the dorms of the glorious hero school, U.A, as our beloved Deku and his classmates rise to prepare for a new day, they all were interrupted by a loud thud in the common room. How will our varied Undertale characters cope with being transported into Japan, in a world full of Quirks, Villains, and Qualified heroes, with being stuck in a high school with 16 year olds as well? What challenges will they have to overcome? And how will they get back to their homes in their altered states? --------------------------------------------------- Authors Note: This story begins to take place at Underverse 0.4 and after the Shie Hassaikai Arc(part of season 4) in MHA, so spoiler warning for those parts. Please bare in mind I own none of the characters in this story and they all belong to their rightful owners. ----------------------------------------------------- Ships: There will barely be any shipping in this, only 2 will slightly feature, including: Cream-Cross X Dream(Canon) IzuOcha-Izuku Midoriya x Ochaco Uraraka(Canon) -----------------------------------------------------