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Underfalls: The COMPLETE Trilogy To A Gravity Falls/ Undertale Crossover

PixaneFangurl510

Reads 53,957
Votes 1,365
Parts 40
Time 2h 30m

Reads 53,957
Votes 1,365
Parts 40
Time 2h 30m

PixaneFangurl510

crossover dipper gravityfalls mabel papyrus sans underfalls undertale

The tale of how two twins from Gravity Falls, Oregon fall down Mt. Ebbot, and experience what most other humans have never seen before, and now, all three books are in one place!

DISCLAIMER: I DO NOT OWN GRAVITY FALLS OR UNDERTALE, ONLY MY IDEAS AND PLOT TO THIS FANFICTION. THANK YOUAll Rights Reserved

crossover dipper gravityfalls mabel papyrus sans underfalls undertale

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40 parts

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Bloodfall (An Undertale AU) by BlackStormWolf

Ever since the death of his younger brother. Things have gone downhill in the surface world for Sans. Alphys died a few months after Papyrus to a disease, Mettaton and Undyne, especially Undyne, had fallen into a depression. Flowey dissapeared into mt. Ebott, not to be found and Sans is fighting depression and insanity. One day, Sans discovers a suspect to his brother's death. A being that is trapping anyone who had either fallen into Mt. Ebott or stayed behind in snowdin for a while. Sans, along with Frisk and Undyne, go into the underground themselves to confront this being. They must encounter the Bloodfall that traps and kills anyone who dares pass by waterfall. (This takes place after a true pacifist run if one killed Sans in a Genocide run, but reset their game before getting to Asgore(I did this in a way to quit the Genocide route). This is if Frisk choses to do this the Pacifist way. I might make a Genocide one in Story Shorts. Also, My Sans is a human, but feel free to interprate him as a Skeleton if you ever choose to use this AU. Just credit me!)

I'll Never Leave You: Sequel To You're Mine (A Monster Falls Fanfic) by xXLunaNovaXx

[COMPLETED] *This is the SEQUEL to You're Mine. If you haven't read that I suggest you read it first!* Dipper was truly happy. He and Bill were mates, they had two beautiful children, and they even have another little one along the way. Things couldn't get any better but they could certainly get worse. Once again Dipper is plagued by nightmares, coincidentally beginning on the night of Bill's disappearance. What is Dipper to do when left alone, with two children, and not to mention he's a pregnant male. Though he fits in the strange town of Gravity Falls, that won't stop outsiders from coming. With Bill gone he'll have to rely on his friends and family once again. *WARNING* This story contains BillDip (boyxboy) *All characters belong to Alex Hirsch and Disney. Any photos used belong to their original owners.*

Weirder Things (Male OC X Wendy Corduroy) by Cowboy-Alchemist

Cross-posted on Fanfiction.net. Patrick Pines is just another average 16-year-old boy. He like video games, old B-movies, drawing, and reading. He was serious, fun-loving, and brave. And he also has anger issues. Among his family and friends, he was a protector, a moral compass, and a voice of reason. Just like every teenager his age, he was ready to spend another summer at home. But this summer will be different. When his parents learn that his aunt and uncle were going to be sending his cousins, Dipper and Mabel, away from home, Patrick is sent with them. Together, they go up north to a sleepy little town called Gravity Falls, Oregon. To stay with their Great Uncle Stan in his house that he converted into a tourist trap called the Mystery Shack. All things were going normal and boring for them beginning, but there was always a palpable feeling that the woods all around them hide something of a dark secret. And then one day they find a mysterious journal in the woods. The moment they opened that book, it becomes clear to the three kids that things were not normal in this remote town. From aliens, conspiracies, cryptids, strange and violent deaths, ghosts, mysteries, other dimensions, and the unexplained. Gravity Falls would prove itself to be the very core of paranormal activity, supernatural phenomenons, and mysterious creatures. Follow Patrick as he and the twins help Stan run the Mystery Shack, while also doing everything he can to protect his family from the weird and dangerous supernatural forces that threaten to destroy them, as they investigate the local mysteries and unlock the secret of weirder things going on in of Gravity Falls. WARNING!: Some incorrect spelling and grammar.

{DISCONTINUED}Our Love is a mystery(Dipcifica) by LapisLover

This book is discontinued please read my other Gravity Falls fanfiction! Just a cute story about Dipper Pines and Pacifica Northwest. Again please read my Gravity Rises AU for some cute Mabeon. Or my Steven Universe fanfiction for actual updates.

When Gravity Falls and Earth becomes Sky by grapesplease

Fear the beast with just one eye. Everyone has a purpose in life. My purpose happens to be a search for a sense of self. This led me to the sleepy town of Gravity Falls Oregon in search of my Grandfather, Stanford Pines. Stanford was a hero to me, we're both so similar to each other, it's like I've finally found a place where I belong. Nothing could ruin this... ** This fic is set in gravity falls the summer after weirdmageddon, it strays a bit from the canon obviously because it's a fanfic, it's not gonna be 100% canon. Bill Cipher will be a major part in this fic bc yass! Mabel and Dipper are 13, the reader is 19 I'm trying to make it as gender neutral as possible but I am a female so low key writing it with female in mind, but anyone can read! It's not gender specific. The reader uses they/them pronouns but you can just sub them for whatever pronouns you want to use 🫶

Finding Our Way Home ‖ Crossover AU by StarFallerXD

[COMPLETED] Unintentional dimension travelling. That's basically the whole plot of this fanfiction. After chanting a spell without any second thoughts (thanks a lot Mabel), Dipper and Mabel have to find their way back to their home dimension by visiting other unusual realities in the whole universe. Some dimensions are just different variations of their home, while others......well they seem to only be able to exist inside their imagination, but they somehow exist there. I DO NOT OWN ANY CHARACTERS IN THIS BOOK. THEY ALL BELONG TO THEIR RIGHTFUL OWNERS.

A Summer to remember. (Mabel Pines x male reader) by JKraken22

You live in Piedmont California and your parents decide to sent you to a mysterious place in Oregon called gravity falls for the summer. Despite initially being against it, on the bus you meet two twins...and the girl of your dreams. (gravity falls belongs to Disney and Alex Hirsch, cover art belongs to GlancoJusticar)

My Undead Brobro [Complete] by DraconaMalp

[Book 1: The Beginning] Gravity Falls Fanfic Mabel Pines and her twin brother used to love solving mysteries. Now it seems all her twin, Dipper wants to do is moan and limp all day. He doesn't have any arms, but that doesn't stop him from trying to hug her! No matter what Wendy, Stan or anyone says, she's keeping him. He's just a bit sick. Her great uncle Stan always insists on putting him out of his misery like his handyman, Soos and the other mindless zombies, but Mabel believes Dipper isn't mindless. Dipper is still the same brobro, right?

Unexpected Love by DramioneLove4Life

*A Gravity Falls fanfic* (Stan x Plus Size OC Character) Stanley Pines is tired of the same old routine, he wants something new. And it's not money this time ⚠️𝙰 𝚜𝚘𝚖𝚎𝚠𝚑𝚊𝚝 𝚜𝚖𝚞𝚝𝚝𝚢 𝚏𝚊𝚗𝚏𝚒𝚌⚠️

Underfalls: A Gravity Falls/ Undertale Crossover by PixaneFangurl510

"Dipper, there is one last thing to prevent Bill's reign of terror for good. You must climb to Mt. Ebbot, not far from here, and retrieve some inter-dimensional travel-block. It will prevent Bill from ever crossing into our realm, and taking over our world." "Ok Great Uncle Ford. I'm on it-" "Oh and Dipper?" "Yes Great Uncle Ford?" "Take Mabel with you. Its dangerous to climb Mt. Ebott one. Legends say that those who climb the mountain never return. Be careful Dipper," "I will. Thanks Great Uncle Ford." ~§~§~§~ Dipper and Mabel Pines are your average twins, spending the summer at their "Grunkle" Stan's Mystery Shack. But, as the summer progresses, Stan's twin brother, Stanford, returns. Bill, the evil inter-dimensional mastermind plans to cross over into the world of Gravity Falls, and the apocalypse of "Weirdmageddon" draws near.Then the twins are forced to Mt.Ebott, where theyll do the unthinkable...

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Slide 1 of 10

Bloodfall (An Undertale AU) cover

I'll Never Leave You: Sequel To You're Mine (A Monster Falls Fanfic) cover

Weirder Things (Male OC X Wendy Corduroy) cover

{DISCONTINUED}Our Love is a mystery(Dipcifica) cover

When Gravity Falls and Earth becomes Sky cover

Finding Our Way Home ‖ Crossover AU cover

A Summer to remember. (Mabel Pines x male reader) cover

My Undead Brobro [Complete] cover

Unexpected Love cover

Underfalls: A Gravity Falls/ Undertale Crossover cover

Bloodfall (An Undertale AU)

Ever since the death of his younger brother. Things have gone downhill in the surface world for Sans. Alphys died a few months after Papyrus to a disease, Mettaton and Undyne, especially Undyne, had fallen into a depression. Flowey dissapeared into mt. Ebott, not to be found and Sans is fighting depression and insanity. One day, Sans discovers a suspect to his brother's death. A being that is trapping anyone who had either fallen into Mt. Ebott or stayed behind in snowdin for a while. Sans, along with Frisk and Undyne, go into the underground themselves to confront this being. They must encounter the Bloodfall that traps and kills anyone who dares pass by waterfall. (This takes place after a true pacifist run if one killed Sans in a Genocide run, but reset their game before getting to Asgore(I did this in a way to quit the Genocide route). This is if Frisk choses to do this the Pacifist way. I might make a Genocide one in Story Shorts. Also, My Sans is a human, but feel free to interprate him as a Skeleton if you ever choose to use this AU. Just credit me!)