Undertalegaster Stories

Even though the Underground is now empty, except for some people, you still stupidly managed to fall in the once prison for monsters. Who knew you would get away from th...

"Do you not want to go back home? To the surface?" °°°°°°°°°°°°°°°° "No." °°°°°°°°°°°°°°°° "Why?" °°°°°°°°°°°°°°°° "Because my home i...

[👎︎✌︎☼︎😐︎ 👎︎✌︎☼︎😐︎☜︎☼︎ ✡︎☜︎❄︎ 👎︎✌︎☼︎😐︎☜︎☼︎] After you and Frisk freed monsters from the underground. You felt like your journey was finally over, that you helped f...

WARNING: THIS CONTAINS HIGHLY MATURE CONTENT (BLOOD, VIOLENCE) READ AT YOUR OWN RISK Money can change a lot of things. It can even change your destiny. Plunge yourself i...

The fall lasted for mere seconds, and yet it felt like an eternity. The adrenaline rushing through your veins proved useless, as there was nothing you could do. You hit...

One day, Sans fell sick. His sickness came out of nowhere and it cannot be cured no matter how many medicines Gaster gave him. Because of the sickness, Sans stayed still...

If you have a request, you can comment or message me! I'll do lemons and fluff, whatever you request. Gaster Gang goes to Bunnymuse! Photos not mine unless said!

Humorous Sanster. I made this on a plot generator, please don't murder me. not NSFW, so enjoy. (I will possibly write a full sloppy-ass story of it later.)

hello! i'm back! :)

what happens when Mike is sucked out of his au and thrown into another due to a malfunctioning machine?

Ok,Ok, I Know Most Other People Have Already Done This But I'm Really Into The Fandom So Imma Just Do It Anyways ;-; Also I Will Be Doing Gaster x Gaster , Gaster x Read...

My friend told me about an interesting story after the events of Undertale Genocide. Spoilers!

When Stars's past was dark and confusing, someone came to help and give some clarity. After that, Stars never saw the stranger again, until he is in the void. A Fanfict...

In the undergrowth,time has reseted.As usual,Sans is the only one who remembers Frisk and how they freed them,only for the world to weirdly reset later on in the year.He...

a fanchild of an oc undertale of mine with sans The skeleton undertale does not belong to me on the first page i will explain who linas

It was a pleasant night for (Y/N), that is until a portal traps her in a place with magic talking skeletons. Will she be able to leave or will she be stuck there forever...

There's a girl who lives alone with full darkness around her. She's familyless and had PTSD. Her name was Syafiqah, who run away the girl from been killed. But one day...