After Toriel, the caretaker of the ruins, suddenly finds herself in a mysterious underground laboratory she discovers a refrigerator full of unlabeled beakers and test tubes and foolishly drinks one starting a chain of weird transformations. This story is based on the potions scene from Scooby-Doo 2 monsters unleashed

An adult Frisk finds themselves exploring a very different underground. Terrifying at first once they realize that the monsters are more bark then bite, (unless they ask nicely) Frisk finds themselves growing more and more curious about the strange creatures dwelling under mount Ebbot.

What if the war never happened the way it did; Monsters enforced a peace back into the land after and now many years later, things take place in a new stadium, in a new life. Frisk in the care of a very motherly Monster, Asriel dealing with his father's new less than legal business, All the while juggling an offer he is to give.

Nous sommes dans l'AU de Undertale : Disbilief Papyrus. Au cours d'une route génocide, Sans se met en travers de l'attaque de Frisk, se la prenant au passage et téléportant son frère à Waterfall avant de mourir, Undyne patrouillant à Waterfall pour y intercepté et tué l'humain, va trouvé un Papyrus dévasté...

A kid falls down a vast chasm into the deep, and is set upon by countless monsters eager to murder whoever falls down and claim their souls. Somehow, this child is the villain in your story.

this is what I would do if I was frisk

No matter how many times we remake this world, the memories of past friendships still remain. For some of us anyway. These are the tales from the Underground, recalling laughter, tears, and some truly ghastly spaghetti.

Frisk had never been someone good with words. Then again, he had never been good with people in general. Mean, rude, and with a personality barely anyone could love, it was no wonder he would end up alone, hurting everyone that he had ever interacted with... but even then, even when he had always been blind, he could still feel the light and warmth her soul radiated.

this is what I would do if I was frisk

How do you get through to your recently reanimated son, when he feels like a completely different person?

(Originally posted on AO3 on 5/12/23) An undertale post true pacifist route salphys fic with fluff and some hurt/comfort. Alphys needs help with taking steps to overcome her trauma related to the True Lab, and she knows who's perfect for the job. But things take an unexpected turn after a while...

(I started this a while ago and uploaded the first version of the first chapter on another account and have since lost access to that account. I’ve changed a lot of the story since then.) Sans, Frisk, and their AU variants discover each other’s worlds and end up on a high stakes mission to get a valuable item back from a rather dangerous and uncooperative version of Sans.

How would things have gone differently if the six children that fell into the Underground before Frisk were taken care of by the monsters of the Underground? SPECIAL THANKS TO DREAM1990 FOR THE REQUEST!

[Underfell AU] Undyne is weird, and Papyrus doesn't like it. But by the time he tries to understand why, Undyne gives him the lead of the Royal Guard and disappears from his life. But why? Papyrus investigates, as some people try to dissuade him too. Probably because all the tracks are leading to Asgore, and that if he doesn't give up, he might lose way more than his job.

"The little girl just could not sleep because her thoughts were way too deep, her mind had gone out for a stroll and fallen down the rabbit hole." - A life of fear is not what Frisk ever expected to have. - Warning: this is a dark AU that tackles mature themes and is not recommended for sensitive readers.

After getting through the entirety of Undertale and Undertale Yellow, the latter being able to be beaten on every route, Scarlet Johnson wakes up from a slumber to find himself in the body of Frisk and being joined by Chara. And after learning he's in the Undertale universe, but with nods to Undertale Yellow, he needs to get through or die trying. T rated for language and innuendo.

Luna ends up in the Underswap universe. Done as a request for paradise dazzleshine. :)

just a few one shots for my OC of ErrorSans, Sol Reapa. one of the few known as a traveler. that means Sol can move though the void between multiverses. I have expanded this to an ability to move around the entire multiverse, regulating undertale AU multiverses to a 'pocket verse'. this way it is easy for him to go to other fandoms. so large crossovers will happen.

The world is destroyed. Strange creatures no one has seen before have swarmed the planet, killing everything save a small band of Monsters, and soon, even they will be gone. Their only hope, a thousand years in the past. Traveling back to the war of humans and Monsters, Frisk and their friends hope to change the outcome of the war to avert this horrible future.

Does not contain the word 'f-ck'. (sh!tpost)

According to all known laws of aviation, a bee shouldn't be able to fly... (sh!tpost)

You know, being dead for a couple of centuries gives you time to think. About your choices. About those you hurt. And for me, it gives me the opportunity to mourn and fester in the guilt of being unable to save the ones you love.

And ends the world. (sh!tpost)

Basically a literary port of a YouTube video, which itself is a parody of the SLACKICiRCUS techno cover of the song by the 4 Non Blondes. Papyrus accidentally absorbs Frisk's soul, and, now bursting with DETERMINATION, grows fabulous hair and cannot hold his urge to SING! (sh!tpost)

Obvious spoilers. My thoughts on Undertale. (sh!tpost)