Undertalecrossover Stories

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33 Stories

  • Universe Tale by Jaybird_Dragon2021
    Jaybird_Dragon2021
    • WpView
      Reads 33,792
    • WpPart
      Parts 16
    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.
  • Louds In Pun-derland by Cantthinkofonr
    Cantthinkofonr
    • WpView
      Reads 158
    • WpPart
      Parts 3
    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.
  • Mater's Undertale (Cars X Undertale Crossover Fic) by ThatCarsUndertaleFan
    ThatCarsUndertaleFan
    • WpView
      Reads 93
    • WpPart
      Parts 4
    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.
  • What's a Glitch? - Another Undertale x MHA Story by IrainandthunderI
    IrainandthunderI
    • WpView
      Reads 217
    • WpPart
      Parts 1
    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 keep him safe Undertale Deku is suspicious of his hero self. So he investigates, and shocks to what he found... Started: December 3, 2020 Ended: ...
  • Here we are by lizzyAfton0634
    lizzyAfton0634
    • WpView
      Reads 512
    • WpPart
      Parts 2
    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
  • Secret Sisters by Flowelette
    Flowelette
    • WpView
      Reads 125
    • WpPart
      Parts 1
    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!
  • Max and the Monsters- a crappy Undertale fic by MaxwellJacksWrites
    MaxwellJacksWrites
    • WpView
      Reads 63
    • WpPart
      Parts 3
    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.
  • Fnaftale by fireistheanswer
    fireistheanswer
    • WpView
      Reads 362
    • WpPart
      Parts 3
    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_simp10220 they're an amazing user and I'm sure you'll think so too. I only own the storyline and my ocs, minus Luna as that is the oc I created of my friend.
  • My Hero...Verse?//MHAxUnderverse Crossover// by Cosintany
    Cosintany
    • WpView
      Reads 2,540
    • WpPart
      Parts 5
    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) -----------------------------------------------------
  • Universe Tale Future by Jaybird_Dragon2021
    Jaybird_Dragon2021
    • WpView
      Reads 2,494
    • WpPart
      Parts 24
    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 is expanding through out the surface. Everything is perfect,so perfect, that Steven starts to feel like he isn't needed anymore. How will Steven cope with this and will Chara help in the end? Find out now! Continued version of Universe tale A/n: Again, none of the characters belong to me and I own a little of the plot but i'm basing it off of Steven universe Future. Also, at first, I wasn't going to make this because I thought it wouldn't be that great but it sorta got 1st place in undertalecrossover, so thank you to all of those who read the first one! I'm also sad Rebecca Sugar has left. WWWWHHHHYYYYYY!!!!!!???????
  • undertale,creepypasta,fnaf crossover... by ElizabethWinchester7
    ElizabethWinchester7
    • WpView
      Reads 111
    • WpPart
      Parts 2
    ehjedhi did this cauz i bord
  • The multiverse (Book 1) (+me and @Krystal_GlitchGirl) by Bils1Bitxh
    Bils1Bitxh
    • WpView
      Reads 204
    • WpPart
      Parts 11
    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?
  • Fallen Countries by AlyChng123
    AlyChng123
    • WpView
      Reads 144
    • WpPart
      Parts 3
    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.
  • Old Times (Half-Life X Undertale) by TheSandvichEater
    TheSandvichEater
    • WpView
      Reads 846
    • WpPart
      Parts 4
    A story on how Half-Life meets Undertale...
  • klee meets undertale ; ᵃ ᵘⁿᵈᵉʳᵗᵃˡᵉ ᵃⁿᵈ ᵍᵉⁿˢʰⁱⁿ ⁱᵐᵖᵃᶜᵗ ᶜʳᵒˢˢᵒᵛᵉʳ ( ◠ ·◠)ა by ryshuko
    ryshuko
    • WpView
      Reads 1,100
    • WpPart
      Parts 2
    ♡ : 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.
  • Once Upon an Error by SugarTeA636
    SugarTeA636
    • WpView
      Reads 64
    • WpPart
      Parts 2
    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)
  • Undertale Au stuff by Amber_Afton_Schmidt
    Amber_Afton_Schmidt
    • WpView
      Reads 46
    • WpPart
      Parts 4
    Yep, I've gotten into UnderTale a bit. Here ya go
  • Into the Darkness ‖ GF X UT by StarFallerXD
    StarFallerXD
    • WpView
      Reads 885
    • WpPart
      Parts 4
    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