1 - 20 of 223 Works in Amalgamate(s) (Undertale)
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The Doctor's Descent by Feanyx1
Fandoms: Undertale (Video Game), Doctor Who (2005), Doctor Who, Deltarune (Video Game)
25 Jun 2025
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Summary
He thought that the radiation would kill him. He thought that his time as the Doctor would come to 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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Frayed Strings and Broken Promises. by TheHourglassForest (HourglassForest)
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
25 Jun 2025
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Summary
A life cut short,
sometimes can be a life worth saving.But is the effort required in doing so worth it?
And if done, what would be the cost?
There's no such thing as a deal that is too good to be true.And yet, some don't heed the warning.
This will cause devastating effects later on.
It's up to Clover and their friends to figure out how to deal with this situation.Series
- Part 1 of The Forest Beyond
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Justice is filled with kindness by banana_hater
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
23 Jun 2025
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Summary
Clover got tired of life and he crouched down in a hole.
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A Glass Full by MahinaPea11
Fandoms: Rockman X | Mega Man X, Undertale (Video Game), Undertale Yellow
20 Jun 2025
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Summary
History repeats itself in many ways.
He had seen this many times before. And yet he still felt compelled to do something like that one night in the Ruins.
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The second part to Kingdomtale. Will our protagonist be able to make friends with everyone and stop the second war? We’ll just have to find out!
Warning: may contain mentions of abuse, violence, blood, dust, death, depression, attempted suicide, cursing, romance, weird/Toby logic and ships. If any of these bother you then probably just continue to not read this series, otherwise please enjoy yourself. This takes place after part 1 and humanity’s creed. Again our protagonist Frisk is only referred to as a girl or she/her when it’s the humans talking due to the time setting and because of the morals discussed in humanity’s creed. Otherwise they are referred to as they/them (nonbinary pronouns. Or whatever other nicknames I mentioned in part 1). All oc’s are owned by me, other characters are owned by Toby Fox.
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Summary
Clover had done everything he’d set out to do. He had found out what became of the Fallen Children, helped his new friends resolve their issues, or at least put them on the road to doing so, and now all that was left to do was to finish his journey…and face the destiny that awaited him at the end of the road he had chosen.
But what if, instead of immediately hopping right to giving up his soul, he took the time to stop and weigh all his options? Along with the pros and cons of each? And in doing so, what if he realised there was still one more loose end to tie up? Perhaps even one more soul that needed saving?
It's not like this one deviation from the script will change all that much, right?
….Right?
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Summary
No one asked for this outcome.
No one wanted to be trapped, separated from the world for fourteen years.
No one in the situation believed it would last forever.
So, what do you do when you're aware of the timer above you? You make the best of it, or you run.
TLDR: the Amalgamate Experience from the POV of its luckiest members: Kanako, Posey, and Doctor Alphys.
Series
- Part 2 of Battle Scars
- Language:
- English
- Words:
- 6,337
- Chapters:
- 1/?
- Kudos:
- 3
- Hits:
- 137
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Summary
Hush now, little one. I have a story to tell. A story about humans and monsters.
Frisk Estrella lived on the surface, and was just one face in the crowd of thousands within the large city. Buckling under the pressure on his home life and internal forces preying at his mind, the last think Frisk wanted was to end up being on the run from the cops. Unfortunately, some don't get a happy life.
After a confrontation leads the boy wanted for murder, Frisk ends up in the bottom of Mount Ebott, where he discovers a civilization of mongers just below his feet. To anyone, they would be horrified, and would try and venture through to leave.Frisk however, finds himself growing familiar with this place of monsters, and soon enough, thinks about staying. But as he makes friends and allies, hundreds of years of history begin to rear their heads as Frisk must confront enemies that could threaten not just the Underground, or humanity, but the very nature of existence as well.
In order to save his friends, and himself, Frisk must have DETERMINATION to survive.
- Language:
- English
- Words:
- 12,154
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 10
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Summary
It's all gone. The lab was destroyed. He could smell the blood of the few humans who had worked there
and it smelled delicious
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This universe is right in the middle of an amalgam breakout. Follow several characters as they each find they're own ways through the desecrated universe. -
Welcome To The Underground (Season 1) by MyLoveForYourFantasy
Fandoms: Undertale (Video Game), Glitchtale Rewrite
05 Jun 2025
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Hello 👋🏼, & Happy Wednesday Afternoon Everyone, This is gonna be a "Glitchtale Rewrite", with HUGE differences.
This is also heavily inspired by "What is Left Behind" By EmmaSmoke:
https://archive.transformativeworks.org/works/54889081/chapters/139135684&
"Undertale Sevenfold" By Rotengen:
https://archiveofourown.info/series/4149664Series
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Worth A [Shot] by Grand_Spurinko
Fandoms: Undertale Yellow (Video Game), Deltarune (Video Game), Undertale (Video Game)
31 May 2025
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Summary
Clover is torn between his duty and his chance at a better life.
Flowey must figure out why his RESET button isn't working.
Martlet, Ceroba, and Starlo have to figure out how to care for Clover.
Above all, Spamton G. Spamton must figure out how in the [All Expenses Paid Vacation] he got here... and maybe make some [Deals] along the way.
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Those Who Remain by PatriotsPeak
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game)
31 May 2025
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Summary
Melody, the soul of Integrity, finds herself in a unique circumstance.
She should be dead. But she's not. Her brother Clover should be dead. But he's not. The monster who's stolen her soul should be dead.
But she's not.
Trapped within the body of another, there's only one thing left for her to do.
She's going to go find him.
Series
- Part 2 of Encore AU
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One day, someone wanted to play the hit game Undertale by Toby Fox. They completed a neutral run as well as true pacifist. So it was only natural that they'd try genocide next. After countless hours fighting against sans, the player finally gives up and its left to Sans to pick up the pieces.
WARNING: post schedule will be irregular
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Drunk On Power (And Ketchup) by Cat_On_A_Keyboard, Chill_Phil
Fandoms: Undertale (Video Game)
17 May 2025
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Summary
Frisk has been trapped in the same loop for longer than they care to track. They can now consistently break the barrier or get to 20 LV without taking any damage. After getting to Snowdin (again), Frisk decides to try something different.
Proofreading by Chill_Phil
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Justice it’s still needed by MetalMK87
Fandoms: Undertale Yellow (Video Game), Undertale (Video Game)
17 May 2025
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Summary
Once upon a time, in the climax of a history. An human with a mission, and an Monster sacrificing everything for her love, and behind everything the master mind an Golden Flower.
The determination of the monster it’s so strong that it’s looks so discouraging, but the human it’s also very determined, and getting the upper hand this battle it’s now finish, or it should be, instead of an outcome that it’s known, the human isn’t finishing the fight, this make a slim chance for the monster to end up victorious, the flower so angry for what happen it’s so blind that his plan it’s starting to fall apart, and when it’s calm down, it was already too late.
Meanwhile a Young monster that her time should be gone a long time ago it’s starting to wake up. -
Consequences of My Actions (On Hiatus Till I remember how to write) by SexyLinoleum
Fandoms: Undertale Yellow, Undertale (Video Game)
16 May 2025
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The one where Ceroba succeeds in taking Clovers soul, and Flowey doesn't undo it.
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You watch them suggest names and argue with each other as you stand there dutifully like a newly-adopted dog. Rus sidles up close to you and looms over you like a hanging specter. His smile does not look friendly.
“How about..Snowy,” He suggests, his grin widening at the twitching grimace on your face.
How to survive a blizzard and nonconsensual teleportation to a dilapidated sci-fi basement.
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After everything went to black, Clover asked themselfs if this was how death was. If they had anyone to wonder.
It was too dark to see, too silent to hear, too empty to even think about it. A little more and they could feel the cold, hard glass of the container they're inside, trapped for who knows how long. It could be hours, it could be days, or it could be centuries.
It feels like centuries, until it doesn't.
And a dark, misterious ceiling with a light too bright welcomes them. It's not a warm welcome.
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Reaper of the royal garden by molartunes
Fandoms: Undertale (Video Game), Undertale Yellow
26 Apr 2025
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Summary
When a monster dies, its body is crumbled into ash. Traditionally, his family scatters the remains over the monster's favorite object in life to keep them happy. However, it is not always the case that monsters die with their family or have family still with them. In such cases, a royal reaper must take care of them. For the current time, this is a moth named Richard: a boss monster who took over the job from his father. Learn about the life of the Underground and about one who whatches it perish.
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Alphys is trapped in the dreary nightmare of her amalgamate crisis, but finds herself interrupted in her cycle of self-hate when a mysterious man no one remembers suddenly re-manifests in the true lab.