1 - 20 of 179 Works in Alternate Universe - Gaster Blaster (Undertale)
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Summary
Killer had his babybones, Crescent, very recently. This seemed to have just amplified his own selves instincts up to 100.
But,when Dream eats a negative apple,band becomes shattered..
Nightmare had changed too..
Passive didn't remember him. Passive was never him.
He attempts to join shattered, to keep his child safe. But shattered didn't want to risk killer's life.
So he advised killer to leave this multiverse, and find a safer one. For his and his child's sake.
He travels and finds many, many multiverses that wouldn't take him..or his child.
But, when he accidentally falls into a portal, leading to a nightmare variants home...
Will he find himself a home there?
Or will he and his child have to keep looking?
Series
- Part 1 of Multiversal chaos:)
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Summary
They knew they were different. Urges, insticts, even impuleses. But they never knew how or why. Until Killer and Swap realized they were the same during a battle.
Having to meet in secret and figure out what was going on.
Series
- Part 4 of Undertale AU one shots
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Summary
Gaster signs his son up for petty summer classes at the labs, but his son has better plans. Running around in restricted zones, finding things he shouldn't ....or someone.
WIP (I ACCIDENTALLY PUBLISHED A DRAFT)
Series
- Part 1 of R3written: Alternate Outcomes
- Language:
- English
- Words:
- 57
- Chapters:
- 1/?
- Kudos:
- 3
- Hits:
- 85
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Summary
Cross betrays the Star Sanses and frees Nightmare. The price he has to pay leaves him amnesiac, injured and alone.
Who would give such a broken puppy a new home?
Series
- Part 5 of Nightmare's Clan
- Part 1 of Blind Bad Boi Cross
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When Ink Has An Idea PLEASE Intervene! by ChaosGremlin1013
Fandoms: Undertale (Video Game)
20 Jan 2025
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Ink has an idea to defeat the Nightmare's gang. His fellow Star Sanses decide that he can't do to much harm and leave him be. They quickly come to regret this and Nightmare's gang is not remotely happy.
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Undyne and Papyrus are the best of friends. But when Undyne learns Papyrus's greatest secret, it pushes their relationship to the brink. Things only get worse as she learns of the skeleton brothers' traumatic past, and the horrors of Dr. W.D. Gaster.
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De petites histoires sur de méchants squelettes (collection de one-shots sur les Bad Sanses) by Stygi0_medusa
Fandoms: Undertale (Video Game)
06 Jan 2025
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Summary
Une collection de courtes histoires concernant les Bad Sans et leurs relations, que ce soit romantique ou platonique <3
☆ Les tags sont ajoutés à chaque chapitre
☆ Vous pouvez interpréter les relations comme romantiques ou platoniques
☆ Les histoires ne sont pas interconnectées -
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Summary
The Scientist woke up to darkness.
Well, darkness was not the correct word. It was simply Nothing. He felt like Nothing, as well. But that was not correct. He could not be nothing, because he had a Purpose. He had a Mission to fix something.
He could not remember what it was. But it was no matter. For he was a Scientist, and he would find out.
Series
- Part 3 of Smok Signals
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Summary
You're a broke college graduate. You had a job previously and was unjustly given a pink slip with no way to pay for anything including rent and groceries. You are having to survive on the last of your funds. It's been a couple of months since you lost your job. You're looking endlessly for work, as your hopes are answered with a gruff voice and a proposal of a job that you wished in your wildest dreams that you could get it.
Will you take his offer? (Y) or (N)
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Reaper est-il tombé amoureux d'un Gaster Blaster ? (oui) by Stygi0_medusa
Fandoms: Undertale (Video Game)
04 Jul 2024
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Summary
Geno souffre d’être seul dans le void, mais plus encore, il souffre de ne plus pouvoir se transformer en Gaster Blaster. Profitant de l’absence de Reaper, il essaye en cachette, en espérant que son amant ne soit jamais au courant de sa nature bestiale
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Entry Number 1:
Dr. Gaster has decided to start a new experiment. He has put me in charge of the major note taking.
He said that we would be creating a new kind of monster. We do not know what he means by this, as he refuses to elaborate.You're a recently graduated Magic and SOULs Biology major from MT. Ebott University. Your boss has decided to do the unthinkable. Create a new type of monster, using your SOUL as a base.
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Grillby didn't like being on guard duty, yet it was neccesary, for the darkness attacks happened almost daily now.
So imagine his shock when he slayed the most unusual dark dragon he'd seen, and was now stuck raising its children.
Oh yeah! And he now seems to be sharing a body with these dragon babies' parent!
Grillby just can't catch a break.
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You'd heard about what happened to the monsters- how they'd been captured and taken into custody. They'd been deemed violent and unstable, and there had been a brief public outcry at their treatment, but after that... radio static. That had been two years ago.
You, a dog person with a passion for rehabilitating the rough ones, had been asked to take in an unintelligent 'dog' monster by the name of Tib. He was shy, touch-averse, and made of bones, but ultimately a good companion for a quiet person like yourself. You were probably imagining the emotions in his eye sockets.
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Dream and Nightmare, the dreamtale twins, have a dark secret neither of them have told their teams. Something they were born with that was supposed to be meant for protecting the tree of feelings under any circumstances.
A dark past haunts them and they are enemies, but this secret gets out and monsters learn the true power of the twins.
Dream and Nightmare are forced to put aside differences. -
But like what if XTale was a Gaster Blaster AU? by StrelitziaMystery1097
Fandoms: Undertale (Video Game)
19 Feb 2024
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Hey XGaster uses OVERWRITE to turn XAsriel into Omega Flowey right?
So why not create XPapyrus and Cross to to be Gaster Blasters?
Series
- Part 11 of Undertale AU ideas
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Summary
The Human Attempts To KIll The Saviour Of His Kind, But The Saviour Refuses. A New Fight Starts, With More Clashing Than Before.
The Show Must Go On. . .
LET THE SLAUGHTER CONTINUE!
- Language:
- English
- Words:
- 1,810
- Chapters:
- 1/1
- Kudos:
- 3
- Hits:
- 130
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Summary
Life had been turned upside down for the past 5 years as the demon hounded her through the multiverse. Throwing them through portal after portal in the hopes that she'd break and obey them. Not only did she resist, she finally broke free of the cycle and found comfort in a home full of skeletons.
Letting go of the past is hard, but with help the future looks bright.
________________________________________First fic, but super excited to be posting! I have a beta reader now, but I still mostly post from mobile. Updates will be sporadic.
Not sure how to add certain tags, but reader will be female, platonic Papyrus/Reader and the siren sans is underfell not undertale. -
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Summary
They had been injured during a simple scouting mission to a GB AU. Nothing new but still not what Nightmare wanted to see. Still, the four healed. One month later the moon is full and the boys are unwell... this has the protective side of Nightmare gravely concerned for the wellbeing of his henchmen.
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He needed to find a place with better hunting for his brother's sake. Unfortunately, there is a door in his way and he doesn't know how to get past it.
She was alone and feeling herself slipping into endless sadness. Yet, she has a mission that she is determined to not give up on. -
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Summary
Grillby knows Gaster, and knows him well. But even this fact doesn't make Gaster being a dragon, a fundamentally much more dangerous kind of monster than the elemental could ever be, any less terrifying sometimes.
(Title references Nowe Ateny. Chapter titles are directly quoted from it.)
Series
- Part 2 of Smok Signals