1 - 20 of 2133 Works in Alternate Universe - Underswap (Undertale)

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  1. Tags
    Summary

    After Sans had the genius idea to mess with a machine he had created, he didn't expect that it would have brought versions of himself and his two brothers (Papyrus and Wingdings Gaster) to their universe. Nor did he expect that an old friend of his would introduce him to none other than his soulmate, or that his very soulmate was also his brother's and alternate versions' also.

    Language:
    English
    Words:
    33,235
    Chapters:
    11/?
    Comments:
    77
    Kudos:
    89
    Bookmarks:
    25
    Hits:
    1262
  2. Tags
    Summary

    A drunken night you can't remember leads you to wake up in the very large home of a very large family of skeletons. You try to escape their grasp and pretend like nothing ever happened, but for some reason, they're determined to befriend you. Some try to get a little too friendly. Some don't like you at all.

    But when disaster strikes your home and you have nowhere to go, they're more than happy to lend you their dusty attic. You don't even have to pay rent. What's the catch?

    Oh. That. Well you suppose you could do that if it means having a roof over your head.

    Language:
    English
    Words:
    4,930
    Chapters:
    2/?
    Comments:
    16
    Kudos:
    57
    Bookmarks:
    17
    Hits:
    402
  3. Tags
    Summary

    So apparently multi dimensions are a thing, and Mt. Ebott spewed out groups of monsters from different universes. You've basically been adopted by the Fell Clan Alphys and Undyne - Sakura and Scarlet, and, through them, discover that you have a fuckton of Soulmates.

    Who'da thunk?

    Language:
    English
    Words:
    10,086
    Chapters:
    3/?
    Comments:
    56
    Kudos:
    136
    Bookmarks:
    43
    Hits:
    789
  4. Tags
    Summary

    Monsters have been pouring out of Ebott’s mountain range steadily for the past few years. Apparently spurred by the breaking of the key barrier the great ambassador mage Frisk. Therefore the surrounding towns and cities have been getting a boom of new life. Even saving several from becoming ghost towns. This story takes place in one such town just inside the proclaimed land of monsters.

    Series
    Language:
    English
    Words:
    380
    Chapters:
    1/10
    Hits:
    9
  5. Tags
    Summary

    You find yourself out of a job, on the verge of getting kicked out of your apartment because you can't pay the rent and no where to go. Until your newest skeleton friend suggests you move in with them and their cousins until you get back on your feet again. You didn't expect to like living with this many people at once so much though...

    Language:
    English
    Words:
    185,122
    Chapters:
    44/?
    Comments:
    1003
    Kudos:
    2195
    Bookmarks:
    385
    Hits:
    40702
  6. Tags
    Summary

    ~Ava’s Guide to Invading the Multiverse~
    Step One - Go Fishing

    Language:
    English
    Words:
    234,714
    Chapters:
    89/?
    Comments:
    2226
    Kudos:
    1295
    Bookmarks:
    157
    Hits:
    20228
  7. Tags
    Summary

    Flowers grow, and they wilt.

    That doesn't mean they aren't beautiful.

    Language:
    English
    Words:
    9,742
    Chapters:
    11/?
    Comments:
    34
    Kudos:
    89
    Bookmarks:
    8
    Hits:
    4594
  8. Tags
    Summary

    Fell wants to settle down and have kids with Blueberry, but Red isn't happy about this news. He can't cope with the fact his brother is moving on, so he selfishly goes on one last adventure with Papyrus. A different Papyrus. Stretch.

    Although Stretch is tagging along for his own selfish reasons too. He wants to get a little closer to Red... and the skeleton finally offered to show him around Underfell, so he can't refuse. It's a shame Papyrus is on every Wanted Board in the underground.

    Language:
    English
    Words:
    7,821
    Chapters:
    7/7
    Comments:
    1
    Kudos:
    10
    Hits:
    113
  9. Tags
    Summary

    (Y/n) lost her job, which sucks. If only she hadn't lost her second job, and apartment, as well! Now all she's got is a camper full of her crap on the back of her truck, and nowhere to go. At least she found this campground, even if it is in the middle of nowhere, and looks like no one has been around it for a while, and a skeleton with a head wound tries to make her into a meal... Rough start to making new friends, but his brother is sweet enough!
    And then there's the other skeletons who inhabit the other cabins, who all look vaguely similar... Their explanation of "cousins" only goes so far, but there are more concerning things to worry about, like how almost every skeleton is trying to get into her pants, their heats, and where her clothes, particularly her socks, keep disappearing to?!

    Language:
    English
    Words:
    30,438
    Chapters:
    12/?
    Comments:
    302
    Kudos:
    473
    Bookmarks:
    111
    Hits:
    7248
  10. Tags
    Summary

    You are a former human from our world. One day you suddenly woke up in the Undertale Multiverse.

    As Error Sans.

    Normally this wouldn't have been an issue for you. You've had lot's of practice in avoiding people and dodging unwanted drama. Just stay in the Anti-void and don't get involved with Ink or anything else.

    But there's a problem with that.

    The original Error is missing, and, without him, there's no one around destroying copies of AUs and keeping the balance of the Multiverse from tipping. Naturally you would be most qualified for the job, right? Wrong. You are a pacifist. A Creater. You would rather do anything else than hurt another person. Too bad your code is centered around causing complete and utter destruction.

    Oh yeah, and you may or may not have accidentally "kidnapped" a random Underswap Sans in a impulsive last ditch effort to preserve his collapsing timeline. And it turns out it was not just any Underswap Sans. No, this one is part of curtan group of skeletons you've been trying to avoid.

    The Star Sanses.

    Who are now somehow convinced you have amnesia.

    Shit.

    Language:
    English
    Words:
    1,445
    Chapters:
    1/?
    Comments:
    15
    Kudos:
    84
    Bookmarks:
    20
    Hits:
    247
  11. Tags
    Summary

    As soon as Blue was freed from the Anti-Void, he knew that he had to go back someday and help Error.
    This was difficult, however, when you realize that your life will never be the same again.

    Language:
    English
    Words:
    2,412
    Chapters:
    1/?
    Comments:
    9
    Kudos:
    16
    Bookmarks:
    6
    Hits:
    58
  12. Tags
    Summary

    You are a college student struggling to survive, and the universe don't take easy on you. Living with skeleton that don't like you for no reason don't help.
    Determination won't be enough to keep living in this hell. And a friend of yours make sure you remember that everyday.

    Now the breaking news:
    - I love comments
    - No beta reader
    - English is not my mother language
    - Long time until next update
    - I am as bad as Asgore to name and nickname the characters

    Language:
    English
    Words:
    28,366
    Chapters:
    12/?
    Comments:
    399
    Kudos:
    444
    Bookmarks:
    82
    Hits:
    7601
  13. Tags
    Summary

    The drabbles keep coming, even more shorts written for the By Any Other Name universe!

    Series
    Language:
    English
    Words:
    6,878
    Chapters:
    5/?
    Comments:
    89
    Kudos:
    119
    Bookmarks:
    4
    Hits:
    1037
  14. Tags
    Summary

    The lives of a captain and a medic in the army are two very different ones, yet they have come to intertwine one faithful day. Neither of them have intentions of falling in love, but the universe works in mysterious ways...
    They struggle with many things, and consistency is definitely one. One has trouble with loyalty while the other one is afraid of the relationship that has blossomed between them.
    News arrives that the captain has to be deployed, which tears the two apart and a year later when they meet again, what will they say?

    Language:
    English
    Words:
    5,952
    Chapters:
    4/?
    Kudos:
    10
    Bookmarks:
    2
    Hits:
    70
  15. Tags
    Summary

    Her life had been relatively normal up until this point. A good education and a decent house. Though still had problems with her family and job, but nothing too serious. Then she fell down into an unknown world she never dreamed was even real. Can she make it out of this?
    Well, one thing's for sure, her life will never be the same again after this.

    Language:
    English
    Words:
    58,837
    Chapters:
    26/?
    Comments:
    29
    Kudos:
    73
    Bookmarks:
    20
    Hits:
    1264
  16. Tags
    Summary

    Staying confined inside your house was stressful, even with your mates around you.
    You were having a down-day. The skeletons took upon themselves to take care of you!

    Language:
    English
    Words:
    3,046
    Chapters:
    2/?
    Comments:
    16
    Kudos:
    95
    Bookmarks:
    12
    Hits:
    782
  17. Tags
    Summary

    Short moments of domestic bliss.

    Language:
    English
    Words:
    27,344
    Chapters:
    24/?
    Comments:
    330
    Kudos:
    121
    Bookmarks:
    16
    Hits:
    1611
  18. Tags
    Summary

    You’re from the 1920s.

    A pair of boneheads had been with you every step of the way, out of the slums in the city, and into a life of organized crime and business deals.

    So when the skeleton brothers go missing, you may have freaked out a little.

    Just a little.

    They were your family.

    And you’d do anything for family.

     

    ... Including getting used to all this newfangled technology.

    And the fact you had traveled to an alternate universe about 100 years in the future.

    What the hell is a ‘smartphone’ anyway?

    Language:
    English
    Words:
    15,554
    Chapters:
    6/?
    Comments:
    174
    Kudos:
    437
    Bookmarks:
    87
    Hits:
    3285
  19. Tags
    Summary

    The title speaks for itself, does it not?

    ***

    WARNING: MIGHT CONTAIN SCENES THAT TUG YOUR HEART, LANGUAGE, NOT FOR THE FAINT OF HEART, TALK ABOUT TOPICS SENSITIVE TO SOME PEOPLE AND OTHER THINGS.

    READER DISCRETION IS ADVISED.

    Series
    Language:
    English
    Words:
    41,602
    Chapters:
    25/?
    Comments:
    128
    Kudos:
    161
    Bookmarks:
    19
    Hits:
    2839
  20. Tags
    Summary

    Its an anti harem
    Underswap papyrus is good and so is axe and boots.
    Others bad. Bethany is bad
    But theyll figure that out
    Starts with Red and his instincts to fuck shit up
    Based off a million others but i kinda wanna go for the one by War_zone_writers
    Im sorry if it isnt as good

    Language:
    English
    Words:
    4,759
    Chapters:
    6/?
    Comments:
    86
    Kudos:
    143
    Bookmarks:
    19
    Hits:
    1440

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