1 - 20 of 832 Works in Gerson Boom
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In trying to avert the end of the prophecy, the Fun gang has accidentally caused the end of the world.
Susie has been separated from her friends, and with nothing but her axe in hand, she's prepared to go down fighting.
But moments before she dies, something steps in and sends her to a different world. A world that may just be kinder than the one she grew up in.
Now if only she could have kept all of her memories when she was unceremoniously dropped into the underground.
Series
- Part 1 of Deltarune in Undertale AU
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The Doctor's Descent by Feanyx1
Fandoms: Undertale (Video Game), Doctor Who (2005), Deltarune (Video Game), Doctor Who
15 Oct 2025
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He thought that the radiation would kill him. He thought that his time as the Doctor would come to a sad and brutal end. He was wrong. And that was so much worse.
In his efforts to find himself, and without his companions, he accidentally stumbles onto a monstrous civilization miles below the Earth. With his newfound DETERMINATION and some new allies, he'll come to realize what it truly means to be a friend, and learn how to live his last lives with his head held high.
And make sure that, just this once, everybody lives.
OR
Undertale but the Tenth Doctor replaces Frisk. Fluff, angst, AUs, and timeline shenanigans ensue.
*No knowledge of Undertale or Doctor Who is required, though it is helpful if you've experienced at least one of them.
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December Holiday's mental health was never something to write home about; she'd always had a little bit of a manic and psychotic side to her, and it had only gotten worse with each passing year. But with the plans for her future falling apart, she latches on to one last desperate bid to defy her mother and make it out of Hometown her own way. But that little voice of self-doubt remains in the back of her mind, festering as the months go by. If her final shot falls short, then everything... her relationships with family and lover alike, her psyche, and her soul... will all shatter like a fallen Christmas ornament.
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Unexpected Hero by LemonCake64
Fandoms: Undertale (Video Game), The Legend of Zelda & Related Fandoms, The Legend of Zelda: Twilight Princess, Deltarune (Video Game), The Legend of Zelda: Ocarina of Time
15 Oct 2025
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“Not so fun being stuck in some loop right? Trying to fight to protect what ya got, not getting a choice in it. If I had the choice I wouldn't remember either.” The words oddly felt comforting. Link let out a slow breath, closing his eyes for a brief moment.
He didn't feel alone for the first time in a long time.
And that?
That was terrifying.
“To be honest, I kinda gave up a while ago. Just sat back and let the chaos go on, felt like nothing I did mattered anymore. Everything would just be reset anyways. Stopped caring what happened, that was until you showed up.” The skeleton’s eyes bore back into the Hylian.
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Without History (maybe some things should stay forgotten) by Human_with_no_life
Fandoms: Undertale (Video Game)
15 Oct 2025
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After the barrier breaks, Monsters and Humans have learnt to live together on the surface, there is still many mysteries hidden in the underground. Most of them will stay forgotten or buried forever.
Until a ‘promise’ Sans made with Frisk leads to him telling a long and complicated story. His story, well not exactly 'his', but with as many questions as it answers, it seems to raise more. One thing is for sure; this tale will change everything.
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The life and times of Chestnut "Chester" Holiday, Hometown's other resident human.
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As Kris waits for a call in the Holiday's kitchen, Susie chooses then to question how in the great googly gosh darn did Chapter 3 happen.
Fast forward five minutes and Kris is running for their life, Susie is eating a garden rake, and Noelle is hearing voices in her head.
This is not how anyone involved planned on breaking fate.
(Formerly just called "Hey Kris, it's The Knight")
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New Hometown by NullVol
Fandoms: Undertale (Video Game), Deltarune (Video Game), Undertale Yellow (Video Game)
14 Oct 2025
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School is about to begin for the children of Monster Town, making life all the more hectic for them. That is only reinforced by the sudden appearance of a new human who feels they have no control over their own life.
Tags are subject to change. May go on hiatus a few times as I imagine this one to be on the larger side.
Series
- Part 3 of To Resurface
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"Long ago, two races ruled over Earth: Humans and Monsters." One race feared for their strong souls, the other for their magic, and the mages caught between them feared for both. All silently knew that war would be inevitable. The only thing that mattered was surviving it. One crimson mage understands that well, and is determined to keep herself and those she cares for alive.
Act Two sees Ferris as a young woman coming into her own as a mage. Overall, she's grown content with her life; however, when the Guildmaster orders her to work with the person she despises most for the betterment of the organization, she must leave the comforts of her new home and enter a wider field of conflict.
Series
- Part 2 of Dark Origins
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After the Visitor left behind that angelic abomination who wipe out 90% of humanity, Sam know's that they can't stay in the city. Searching in the former room of Sybil he found the former research of the astronomers and discover a place that was not affected by the visitor, Mt Ebott. He doesn't know why but it seems there is some kind of barrier that keep the place safe during the end of the world.
With only that as his last hope to survive, Sam and his friends go to Mt Ebott but the exalted four find them, taking them one by one until it was only Sam and the childrens.
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Scattered Souls by Eris_void
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
13 Oct 2025
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In the fight with Omega Flowey, when Frisk calls out for help and the souls answer the call, one does something unexpected causing a reset that brings all the souls back to life in the location where they drew their final breath.
Now, with these 8 souls lost throughout the Underground, they have to manage their way. Will they see the sun? Simply die in the pit once more?
Will the lost souls find what they seek?
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Undertale Yellow: Defiant Hope by Kanakoke_K9907
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
13 Oct 2025
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Snowdin, a place usually synonymous with joyous family outings and quality time, became the stage for a cruel twist of fate for young Kanako. She and her family, the Ketsukane, had ventured there for a day of simple pleasures, unaware of the darkness that had recently descended upon the snowy landscape. A human, clad in a dusty tutu, had arrived—not misunderstood or scared, but driven by a chilling love for the game, a thrill for chaos. In this alternate universe, their attacks were not born of fear, but of a cold, calculated desire to kill.
This human stumbled upon the Ketsukane family and, without hesitation, caught Chujin and Ceroba off guard, slaying them where they stood. All Kanako could do was watch in terror as her parents fell, their forms dissolving into dust. The memory, a searing brand, haunts her to this day.
Now many years into the future, she has grown and changed.
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The Last Amalgamate (The Peacock AU edition) by WingsOfShen
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game), Kung Fu Panda (Movies)
12 Oct 2025
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After millennia, the barrier keeping the monsters Underground has finally broken. The entirety of the Underground does not remember what happened. All that is known is that a living human child was involved.
Before starting a new life on the surface, Frisk joins Alphys in sending the final amalgamate back home to her family, making new friends along the way and giving them their much-needed happy ending.
(Based off "The Last Amalgamate" by VyletBunni and the DeltaTraveler team. Credit goes to them for the animation series.)
Series
- Part 4 of The Peacock AU
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Justice In Another Time by Sleepdeprivedbrit
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
12 Oct 2025
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Summary
They were both so similar, yet so different.
Clover had a mission, one he was sent to fulfil.
Chara had nothing, only wishing for a way to silence...
Mt Ebott had the answers for both of them, yet only for each of them separately.
...
So what happens when they aren't separate?Clover has a mission to fulfil, but that doesn't mean something cannot interfere and make him stray from the path.
Chara may want to achieve silence, but that doesn't mean some idiotic cowboy goober her age won't appear out of thin air and completely change the course of history as we know it.I can only describe these events as unnatural, but hey, that's what happens when you let someone brainstorm at 3am.
Through these events, a new story unfolds.
One about overcoming odds, accepting yourself for who you are, bringing hope to a place with none, and most importantly...
Creating sweet Cocoapowder moments, because this ship is adorable.
...
But mostly the important stuff I mentioned before that.So then, ☹︎☜︎❄︎ 🕆︎💧︎ 💧︎☜︎☜︎ ☟︎⚐︎🕈︎ ❄︎☟︎✋︎💧︎ 🕆︎☠︎☞︎⚐︎☹︎👎︎💧︎,
Shall we? -
A world where your impact was heard elsewhere by dream_sky
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword)
12 Oct 2025
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"A long, long time ago, another human fell down here."
"Injured by their fall, they cried out for help."
"...But nobody came."
Or
Chara didn't wait as long for help, and by the time Asriel works up the courage to investigate the cry, they're already gone. The butterfly effect (and the addition of a bunch of my headcanons and ideas) does the rest.
(currently in hiatus purgatory)
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You could understand their confusion. You were just as lost as they were.
You could understand their actions. You would act out just as they did, were the roles reversed.
You could understand their anger.
...But you couldn't understand their hatred.
OR:
The Red Soul has enough and runs away after being beaten with a hockey stick one too many times.
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Before The Story by ako_likes_writing
Fandoms: Deltarune (Video Game), Undertale (Video Game)
12 Oct 2025
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Everyone knows how it happened— the story of UNDERTALE. But today, let me share another. A tale from before that all happened.
A story from when stars were stars, and not gems on a wall. A story from when peace was still a reality, and not yet a wistful dream.
A story— from when skies were once forever blue.
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Frisk takes a ride down the river when they ask the Riverperson for a story. They decide to indulge the young human, and reminisce on days long past, before the war, when they met their first love.
(In other words, this is a UT Kralsei AU lol) -
Distant Souls by Kaboom91
Fandoms: Undertale Yellow, Undertale (Video Game), Deltarune (Video Game), OneShot (Video Game), Heartbound (Video Game), Ib (Video Game)
11 Oct 2025
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The soul is an important part of a persons identity, the accumulation of a person's being. But different worlds play by different rules, so when a force trapped between worlds starts tampering with those worlds, things start to come apart. It'll take the help of a Fun Gang, a Savior, a young girl, a boy looking for his dog, a small cowboy seeking justice, and an incredibly determined human to save all their worlds from the ever looming darkness.
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UDY on the Surface by CommanderBullet
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
11 Oct 2025
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It's been a few years since Monsters returned to the Surface and lots of things have changed... Accompany your favorite characters from Undertale, Undertale Yellow and Deltarune as they try to manage their everyday responsibilities and go through a few wacky adventures while at it in this slice-of-life crossover AU.
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His heart feels nothing anymore. He's broken but times keeps slidding on his back. He lost the one would was about to bring a new life to their household and yet, he must keep on working. Everyone in his entourage is worried sick but he can't give up yet. A certain someone is asking for his services and let just say it went south pretty quickly.