After freeing the monsters from the Underground what's next for young Frisk? Well, there's always the world's most popular trading card game Duel Monsters. With a deck based off of her adventures it's time for the monster ambassador to show everyone what she's made of. Though with dark forces around every corner, she'll need to remember one thing, always stay determined.

A long time ago, two races ruled over earth. Humans and Monsters... but that's a story everyone has heard before. The laws have been changed, fates had been broken, chains had been mixed, concepts and reality itself had been shattered against their will, and reborn into something that shouldn't be possible for the Underverse's standards. Story made with my partner: Crimson Ashmedai

He didn't know what to think, staring down at the talking flower before him, only wanting to turn away and never look back.

A new variable has made themselves known, an unknown group calling themselves "The Delta Vanguard" has been opening up Dark Worlds to cause the Roaring as well as creating monsters called "The Darkened". Now it's up to the FUN Gang as well a few new faces, old and new, to show them why the shouldn't mess with both of their worlds.

Compa and Iffy were discovering a new mountain called mount Ebbot but they wind up falling into the cavern where the monsters reside. Would they have to fight to get free, or are these monsters not like the ones in Gamindustri? Will the folks in Gamindustri try to save them? Is there a dark secret in these Caverns? Will the two girls know what to do when the time comes?

Adrian Shephard, an HECU Corporal shipped off to Black Mesa, manages to somehow escape the hellish facility despite everything and, after being 'detained' by the ever-so elusive G-Man, is assigned a mission... to the UNDERGROUND! Accompanied by Chara Dreemurr, the first fallen human turned apparition, they venture through for a very specific goal... but is that all there is to it?

Youthful. Enforcers. Leading. Liberation. Overthrowing. Wickedness. Joining. Uno's. Stand. Triumph. In. Courageous. Endeavors.

Frisk succeeded in freeing the Underground from the Barrier, and all is freed back to Tamriel... too much they see is wrecked with strife from the Thalmor, and now a Dragon Menace. Teamed up with Jin, a former Soldier of the Imperial Empire, and the fated Dragonborn, they all travel to stop the Dragon Meance, and the Thalmor in a unlikely alliance. (Pairings Undecided)

Two worlds - similar, but different, that connected by chance. Two stories, beautiful, but ending too quickly. One Puppeteer who, by the insatiable will of his fierce mind, forces actors to stage the same plays over and over again. And dolls whose minds have awakened in the hell of their native scene, trying to find salvation among other people's scenery...

No ketchup? CEO Of Hell can get me ketchup? Conclusion: Raid the entirety of hell to find the CEO.

Sans After The Events Of Undertale (Pacifist Route) This Upon Being Released From His Primary Goal And Being Freed From The Fate Written By His Creator This Feels A Void Wondering What Do I Do Now What Should I Do Now, Thanks To A Breach In His World He Manages To Get To A Place Called The Nexus Of The Worlds Bubbles Of Realities That Within Them Are Different Universes And That Th

In the aftermath of Frisk breaking the barrier of Mt. Ebott, and becoming the Ambassador of Monsters, he has a new goal in life; to one day make up with his brother Ken, and not let him down. Arriving back at Tatsumi Port Island later, Frisk, and his friends alongside Asriel, and Chara both back to normal find the Shadows, and join S.E.E.S to stop them. MaleFrisk FemaleChara

When Rita Repulsa hunted down the last of the Mystic-Fu Warriors it is revealed that she made a terrible mistake in doing so.

Waking up on a strange mountain with no memory would have been enough for Percy. Falling down a giant hole and meeting strange monsters that don't know about demigods? Even worse. Now he has a new quest: make it out. Join Percy as he encounters strange friends and deadly enemies, all while questioning if he really is the hero. Takes place in the months before the Son of Neptune.

The Hunters have fallen into the underground, in there they will begin a new adventures exploring new places and encounter new allies and enemies, during their journey to find a way get back home.

A simple question arose one day. What happens if some fandoms and their events take place in the same universe, on the same planet and in the same world, while somehow intersecting with each other? Now with this answer I want to share with you. It all started with a kind fairy tale, telling about friendship and kindness, and a family where there is a child who owns a power...

Oh wow, Sans dropped into another universe, how original... Wait until you see why AU's are by nature an endless well of mess! (Story begin at G.I. 4.2. Update, actual as of 4.3, anything afterwards isn't going to cause rewrites.)

Sonic goes on a killing spree just to finnaly stop this loop... Also T for language

It was any other day in Gensokyo, the land of fantasy. That is until a mysterious child appeared, falling from a great height and injuring themself. Reimu, the Maiden of the Hakurei Shrine, took the child in to heal them. Frisk, now part of this new world, seeks to explore it. Both don't know that this appearance will lead to an upheaval of Gensokyo's powers.

The Underground had seen an incalculable number of resets. Frisk, Sans and Flowey are tired of each reset, but in one reset, two new people fall into the Underground. Will these two break the cycle or will they become a part of it? Spoilers for Undertale and Fnaf Security Breach