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...

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...

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

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...

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...

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

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...

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.)

............to think that everyone would live normally without you, knowing that everyone you once loved had forgotten that you were ever a part of their lives, and no o...

hello! i'm back! :)

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

An alternate version of W.D. Gaster from Undertale, Perfectionist doesn't vary too much from the mysterious and popular character, except... he never died. Perfectionist...

"No no, my ego would never leave. It's part of my charm~" "I'm pretty sure that charm is just bullshit. Being Spamton's assistant meant being a lot of th...

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...

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!

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

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...

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