1 - 20 of 145 Works in Alternate Universe - Gaster Blaster (Undertale)

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  1. Tags
    Summary

    A family doesn't always have to be a mom, a dad and kids. Sometimes it's one mom and her kids, or one dad and his kids. Sometimes it's two moms, or two dads, or even more than that. And sometimes a family is three undead science geeks and two awkward bats.

    Language:
    English
    Words:
    5,937
    Chapters:
    3/?
    Comments:
    8
    Kudos:
    19
    Bookmarks:
    3
  2. Tags
    Summary

    Gaster leaves his sons alone to manage the family estate.

    He is gonna be so pissed when he returns to the menagerie his home has become.

    (Who are we kidding Gaster can't stay mad at those two)

    Language:
    English
    Words:
    3,377
    Chapters:
    1/?
    Kudos:
    5
    Bookmarks:
    1
    Hits:
    34
  3. Tags
    Summary

    Dr. W.D. Gaster wants to create a weapon—a soulless, non-sentient creature capable of killing any human that should fall into the Underground. What he creates is a child.
    ___

    Alternatively: the one wherein Dr. Gaster accidentally becomes a single father raising two skeleton werewolves children.

    Language:
    English
    Words:
    106,770
    Chapters:
    16/?
    Comments:
    358
    Kudos:
    345
    Bookmarks:
    56
    Hits:
    3516
  4. Tags
    Summary

    Monsterkind had nearly been wiped out in the Human-Monster War, left prostate after being trapped under Mt. Ebott.

    Wing Dings Gaster thinks he has an answer to both of these problems.

    Series
    Language:
    English
    Words:
    3,769
    Chapters:
    2/?
    Comments:
    8
    Kudos:
    2
    Bookmarks:
    1
    Hits:
    69
  5. Tags
    Summary

    A belated work for Gasterblastober.
    Hypothetical Super Robot Wars-style movesets for the characters in the different Blaster AUs.

    Language:
    English
    Words:
    8,360
    Chapters:
    8/8
    Kudos:
    2
    Bookmarks:
    1
    Hits:
    26
  6. Tags
    Summary

    When you were born fate said 'fuck it' and decided to have some fun at your expense.

    It's hard enough trying to pass yourself off as a beta to live a somewhat normal life and keep your 'talents' secret at the same time.

    Now monsters are free, you have a hoard of skeletons that won't leave you alone AND soulmates are a thing!? Have fun with that, you're going to need all the luck you can get.

    Language:
    English
    Words:
    20,174
    Chapters:
    11/?
    Comments:
    104
    Kudos:
    391
    Bookmarks:
    107
    Hits:
    4353
  7. Tags
    Summary

    Blue is pretty sure he'd know if he and his brother were off tearing the forest a new one, but he's had weirder days.

    Language:
    English
    Words:
    3,920
    Chapters:
    4/10
    Comments:
    28
    Kudos:
    78
    Bookmarks:
    16
    Hits:
    689
  8. Tags
    Summary

    time heals all wounds until u stab a fuckin knife in it like 8 years later

    Language:
    English
    Words:
    1,453
    Chapters:
    2/?
    Comments:
    5
    Kudos:
    22
    Bookmarks:
    2
    Hits:
    343
  9. Tags
    Summary

    You moved to Mount Ebott to escape your mother and her expectations. You expected for there to be nothing of interest there. So what if there are legends about monsters and missing children. Lots of mountains have missing people. Yet...

    You've been having these odd dreams lately. Each one lands you in a place where the sun never seems to set and an alien white light shines from the skies. You've accepted a task that has put you against sixteen monstrous creatures known as the Keilaises, large skeletal creatures made out of stone, earth, and magic. From each of these guardians, you must retrieve a shard in order to complete your quest.

    You don't know if these dreams are real or not. With your sleepwalking issue becoming more and more frequent, these dreams seem to be out of control.

    ...What's this you say?

    You're saying that monsters have come down from the summit of Mount Ebott?

    ...Did your dream have something to do with this? Or are you just going crazy?

    --

    SAID now has a discord! If you'd like to join and chat with me about the fic, you're welcome to join!

    SAID Discord!

    Series
    Language:
    English
    Words:
    73,631
    Chapters:
    11/?
    Comments:
    155
    Kudos:
    279
    Bookmarks:
    68
    Hits:
    3510
  10. Tags
    Summary

    Red and Edge politely take turns. Sans is okay with this.

    Language:
    English
    Words:
    6,003
    Chapters:
    1/1
    Comments:
    16
    Kudos:
    87
    Bookmarks:
    15
    Hits:
    951
  11. Tags
    Summary

    While training Killer goes a little overboard and accidently injures Cross. Cross ofcourse forgives him, but Killer hates himself for it. How could he hurt his brother?! I mean, it's not the first time it happend..

    Series
    Language:
    English
    Words:
    4,135
    Chapters:
    2/2
    Kudos:
    16
    Bookmarks:
    2
    Hits:
    141
  12. Tags
    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)

    Language:
    English
    Words:
    1,715
    Chapters:
    1/?
    Comments:
    6
    Kudos:
    21
    Bookmarks:
    4
    Hits:
    349
  13. Tags
    Summary

    Sans has many regrets in life. His most current ones involve Frisk...and a truckload of memories he'd rather forget.

    Language:
    English
    Words:
    327
    Chapters:
    1/1
    Collections:
    1
    Comments:
    1
    Kudos:
    15
    Hits:
    185
  14. Tags
    Summary

    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.

    Language:
    English
    Words:
    22,092
    Chapters:
    9/?
    Comments:
    65
    Kudos:
    158
    Bookmarks:
    30
    Hits:
    1380
  15. Tags
    Summary

    It's been almost a full year since little Sans and Papyrus were rescued from W. D. Gaster. Scarred from their experiences, both children will need extra care to come to terms with what happened to them. Now as their father, Grillby needs to guide them through both their recovery and life outside the laboratories. Life is full of ups and downs, but Grillby will try his best. After all, they say that living well is the best revenge. Part two of the TRUST trilogy.

    Series
    Language:
    English
    Words:
    12,096
    Chapters:
    2/?
    Comments:
    32
    Kudos:
    189
    Bookmarks:
    37
    Hits:
    2281
  16. Tags
    Summary

    The barrier is finally broken, and at last all of monsterkind are free to walk on the surface.
    Again.
    Sans the Skeleton is skeptical. Why bother getting excited for something that's just going to reset? This is not the first time the barrier is broken, and probably not the last. He feels the need to take a break for everyone else's enthusiasm and wanders to the ruins where he encounters a ghost of his past. The result of that meeting is something he has been hiding for a long time and that he's determined to keep hidden.

    Language:
    English
    Words:
    72,497
    Chapters:
    15/?
    Comments:
    116
    Kudos:
    350
    Bookmarks:
    42
    Hits:
    6077
  17. Tags
    Summary

    A bunch of GB!Sans oneshots, probably going to be a lot of transformation in it =)

    Language:
    English
    Words:
    34
    Chapters:
    1/?
    Comments:
    3
    Kudos:
    19
    Hits:
    274
  18. Tags
    Summary

    Continuation of a mini story in my week long drabble event.

    What happens after Blaster Slim mates with Black and breeds him?

    A story leading up to and the birth of their child.

    Language:
    English
    Words:
    2,217
    Chapters:
    1/1
    Comments:
    9
    Kudos:
    47
    Bookmarks:
    5
    Hits:
    789
  19. Tags
    Summary

    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.

    Language:
    English
    Words:
    142,853
    Chapters:
    21/?
    Comments:
    293
    Kudos:
    1069
    Bookmarks:
    175
    Hits:
    24567
  20. Tags
    Summary

    Inspired by anime one day, Papyrus tries to show off his special attack. It doesn't exactly go as planned.

    Now he's got a giant skeletal beast to deal with, it doesn't seem to be going anywhere, and that's only the beginning.

    ~This is the original fic version of the fan comic Unexpected Guests, which is posted to my tumblr account by the (approximately) same username undertalethingems. Thanks for reading!~

    Language:
    English
    Words:
    22,766
    Chapters:
    14/?
    Comments:
    36
    Kudos:
    248
    Bookmarks:
    65
    Hits:
    4167

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