What if by some curious opportunity, instead of Wonderland... it was the Underground, the realm of monsters that Alice fell down the rabbit hole into? It's a world just as curious, with as many colorful characters, and things to discover... but is 'kill or be killed', 'mercy or violence', 'a good time or a bad time'. Can her curiosity and imagination open up into determination?

Sans has gotten himself stuck in the void between worlds in a successful attempt to stop the resets of his timeline. He's not sure how long he's been chillin' alone there, but eventually a chance at escape stumbles his way in from the Veil of Death. His name?—Sirius Black. (no pairings)

A twist of fate? The path set by destiny? Or some kind of a prank played by the gods? For one reason or another, you've lost everything yet gained so much more. You have the knowledge and the power to change the world, so use it wisely. Follow your heart, seek out the answers and don't forget - you are not alone.

Frisk woke up in their bed. Their old bed. Had their whole adventure been a dream? Perhaps. But does that really mean that none of it was real? The monsters they met along the way certainly don't seem to think so. (Original post-pacifist AU. Rated T to be on the safe side.)

Fandom called, spaghetti answered.

What if a fan of Undertale somehow ended up in the UNDERGROUND with Frisk (and flavor-text Chara) after a RESET? The story contains Flavor-text-ghost-Chara, an Undertale-fan, vitamin C and D, a bunch of swearing, massive spoilers for all main routes and everything in-between, easter-eggs for the attentive. By the way, you are carrying too many dogs.

In Tristian's Magic Academy, Louise asked the void for the greatest familiar in all the land. In the depths of Waterfall, Undyne wanted to escape the Underground. What happens when these magical worlds collide? Guess this is a case of being careful what you wish for. Set before Undertale Proper. Cover credits to G0966. Rate T for (eventual) graphic fights and (possible) romance.

Papyrus was and is a lively skeleton, and moving to the surface didn't change that one bit. How does a cool dude like him deal with things like interdimensional threats, complex emotions, and a lack of spaghetti? By being the Great Papyrus, of course. Set after the True Pacifist ending, Frisk a little girl. ON HIATUS

A new state alchemist appears. And he's very, very... peculiar. Now that Roy is assigned this strange man, what hijinks will unfold? How many hotdogs can be stacked on the Colonel's head while he's asleep? ... And what is the man's true goal?

The barrier had fallen but humanity had been quick to erect a dozen more in its place. Not physical barriers like before. No, these barriers came in the form of 'human only' signs in the windows of stores and restaurants. They came in the form of organized crime, in racial slurs spattered on the subway walls, in the form of paranoia, in the form of an unspoken border slicing down t

Dr. W.D. Gaster always knew there was something very unique about his apprentice, but he had no idea he was keeping secrets like THOSE. Could Sans really have been holding the key to breaking the barrier this entire time?

Monsters are sometimes humanoid, but even so, very distinctly un-human. Skeletons, on the other hand, are very different creatures. Why is that? And why do they seem to be the only ones?

Frisk didn't save everyone when they broke the barrier. No, they left a soulless flower behind. What happens when they realize their mistake and bring Flowey to the surface? I do not own Undertale. Rated 'T' because I'm paranoid. Cover art by yours truly. -COMPLETE-

Frisk's powers do more then cause Sans grief, they are destroying the fabric of time itself. People close to the anomaly are falling through holes in reality and landing in different timelines. One such unlucky SOUL is Sans, who waits to fight a genocidal child, only to find himself in a strange surface world with an older, more mysterious version of himself. Will he survive?

Join Ink Sans and His Companion Frisk as they protect AU"S, get lost in the Anti-Void , and disturb timelines. Doing their best to keep peace within the Multi-Verse . Inspired by Doctor who ...

Humans are made up of a body and a soul. Without its partner, the remaining part has difficulty functioning; when a soul is stolen, the body has no determination left. But what happens when it's offered, and some determination gets left behind? Well, it can't replicate a human soul. But maybe it's enough for the soul of a monster.

The prophecy of the Delta Rune said that the Underground would go empty, but what if someone is left behind? Not that Frisk's thinking about prophecies. His mind's on the one person he couldn't save. Someone he can't bear to leave. Someone he can't help on his own. But there's one last thing he can try... The story isn't over until the Underground is empty.

Underswap!Sans has landed in a Steampunk-version of his Universe. Due to some gravitational miscalculations, he ends up with a cracked skull and a memory that is sketchy at best.

In a world where everyone's soul is left on display, it is often hard to both hide who you are and be who people want you to be. Sans is no stranger to the judging looks, the frightening whisper or scornful sneers. He's lived with them all his life and has learnt to ignore them. It helps that Caellian is with him as well. The arrival of Frisk and their daemon Chara changes the game

In a moment he was dead, gone... dust in the wind. his soul shattered. Monsters weren't suppose to be able to reincarnate, or if they did actually remember. Underswap universe

It's a happy ending now, everyone knows that. Even Sans knows that, Frisk had reasured him that there would be no more resets after all. Still, things haunt Sans, and everyone is starting to notice. They all want to understand him, to help him. So, G A S T E R takes it upon himself to help move things along.

Why do some people have happy endings and some don't? Is it because some people 'deserve' one more than others? Does the same apply to worlds? A Sans from one world is about to find out, as he steals the happy ending of another. Now everything's messed up. Another Sans doesn't know if he's cut out for this, sounds more like a job for a proper protagonist. Features Underfell AU.

To a local hood rat, "underground" was a modifier of hip hop music. He is at a time where his morality is fading away, leading a life of crime in the city. His "friends" don't really support him, he is without a father figure, and his mother drunkenly resents him. Who would have known these circumstances would lead to a legendary undertaking?

Frisk was living on the surface with their new family. Everything was perfect except, the dreams that seem to belong to someone else. Something is left undone. The past is pulling them back. The world is reset, everything is undone. Somehow, they have to break the cycle and save everyone, and themselves. (pacifist run spoilers)

One timeline appears to be an anomaly in the fabric of time and space. What happens in that timeline? Asriel Dreemurr, Prince of All Monsters, appears out of nowhere in the house of a human.

In your defense, the movies make possessing someone seem much easier. Rated T for implied child abuse and suicide. A look at Chara and Frisk learning to cope with being stuck together. Charisk.

After the human leaves the Underground with one stolen soul accompanying them, the Underground falls back into its regular routine. Except now there's someone missing. Flowey considers what happened to be wonderful karma. Sans doesn't quite agree. Indefinite Hiatus.

Frisk doesn't have the power of reset. And the one who does likes to make really bad jokes.