Underfalls: A Gravity Falls/ Undertale Crossover

Underfalls: A Gravity Falls/ Undertale Crossover

30K Reads 968 Votes 13 Part Story
Ally the Trash Bin (Tenja's Wife) By Marshmewwos Completed

"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...

  • alphys
  • crossover
  • dipper
  • flowey
  • gravityfalls
  • mabel
  • papyrus
  • sans
  • toriel
  • undertale
  • undyne
SamGamer_1542 SamGamer_1542 Aug 02, 2017
Theres a line you missed, something about him saying that someone needed to teach them how things work.
SmolFanGurl40 SmolFanGurl40 Dec 31, 2017
Don't worry I'll spot them and laugh and the newly found word to invent like fre sh a voc a do was invented
When i first read this, i tried to read it without reading glasses(personal goal, dont judge me) and i laughed for a good few minutes when i thought it read ‘then i fear her sh!t  escaping through the caverns
Radical_Jasper Radical_Jasper Aug 09, 2017
Oh leave the 12 year olds to climb up a mountain where people never return! MAN THIS GUY REALLY IS A GENIUS!!
                              *Sarcasm levels at 100%*
Actioness123456 Actioness123456 Feb 25, 2017
I have an idea, the inter-Dimensional travel-block is gonna be the thing that allows them to reset
Actioness123456 Actioness123456 Feb 25, 2017
SUCH A CLEVER WAY TO GET THEM DOWN MT. EBOTT!!!!!!!!!!!!!!!!!!!!!!!!!