Between the stars | OuterTale AU

Between the stars | OuterTale AU

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WpMetadataNoticeLast published Sat, Aug 29, 2026
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Fanfic
Undertale
Alternate Universe (AU)
Game
Howdy, my friends. The whole story will be from the perspective of Sans as the reader, but there might be some P.O.V. changes. Enjoy the story =] A long time ago a war broke out between humans and monsters. After years of fighting, humans won and banished the monster into outer space, to a small galaxy surrounded by a bubble. Years after the war, the royal scientist and philosopher, Professor W. D. Gaster, created an experiment. The experiment seemed successful and he named it... Sans. Undertale is owned by Toby Fox, NOT ME!! I didn't come up with OuterTale either, this is just my take on it. None of the art is mine unless I specify.
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#358
outertale
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Reader insert. What if W.D Gaster didn't just get split between time and space, but actually ended up in your world in an abandoned hospital you called home? Your were a young child he decided to use as experiments to test human determination in said world and breaks physical laws to test human possibility? He knows of the powers you gained from his experiments... all but one, this one allows you to tear realities just enough to teleport into them. Knowing of Undertale you felt bad for the monsters stuck below in their world and wish to help them, but something goes wrong and you end up going to certain AUs and helping them, gaining the attention of some bad skeletons who now desire your power for them-selfish-selfs.

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