The machine in the Skeleton's basement. There's lots of speculation on what it is used for. Is it a portal to different aus? Different timelines? Is it a machine to trap the Player? Is it a machine to free Gaster? Or is it something much, much simpler? Something... forgotten? Memories of a history lost in time? Prequel: What it Means to Persevere Sequel: Lost and Found

You've seen Sans past. So what is Gaster's? What about Grillby's? Welcome to the Prequel of Forgotten History!

The Barrier is broken, leaving the others to wonder if Sans old home is still there and if they can see it. Sans doesn't want to take the chance, but when he disappears, where else can they look?

Monsters are meant to have only one mate in their entire life. What would the Undertale gang do if they found out Classic had three? Thanks to PastaGod_Italy for the idea, it's not exactly a Trio, I couldn't think of one, but it works!

An accident at the C.O.R.E as a boy caused Papyrus to go blind. He never told anyone. He didn't plan on ever doing it. Until he makes it to the Surface and meets a nice girl named Nashira. Nashira seems to be able to read him like an open book and he doesn't know what to think... or what to feel. Original idea is called Tag and can be found in the Fandom Short Stories book.

Dust HATES humans. Dust barely LIKES anyone. When the Bad Sanses are forced to guard a young goddess, Dust gets stuck alone with the child.

They think I'm like them. They think I'm rich with a happy home life. They think I'm happy.. they are wrong. Blue has been friends with Ink and Dream for years. They went to the same elementary school, the same middle school, the same high school, and now the same college. He puts on the same fake smile, pretending his life was just as perfect as theirs. Then he meets them. The street boys that everyone in college fears. But are they really THAT bad?

Outcodes. They were creatures Error created as a means to keep him from being lonely in the Anti-Void. They are weak and can be killed easily since they don't have souls. To Error, they were merely pawns.. until he creates you. You are different from the others he's made and he wants to know why.

In this world, there are three kinds of people. The law, the outlaws, and the Undecided. Most monster outlaws are street racers, being adopted into a monster family you became one too. One thing everyone in the street racing business knows? Respect The Ghost. He is the father of street racing, yet nobody knows who he is. That is why he is called Ghost. When you meet an Undecided monster named Sans though, well.. he may not be as Undecided as he seems.

After accidently getting caught in Underfell by his counterpart, Carrot trys to reform Edge and teach him to be a better brother. Can he do it and more?