Based of the Disney movie TRON: Legacy just with Undertale characters
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When sans was a young skeleton, his father, W.D. Gaster, had an idea that could change the world. That he would make this world a better place once on the surface. And when they got to the surface when sans was 9, he made his company ENCOM and made a game called TRON. But one day, after telling sans a story about his new game, Gaster disappeared. Now without parents Asgore took him an papyrus in and raised them.
Years later, sans is now 23 and while checking out his dad's old arcade after getting a page from Gaster, he discovered something... something extraordinary..
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I HAD THIS IDEA FOR SUCH A LONG TIME AND NOW IM GONNA DO IT!
You would think that with how shit your luck is, you would've been dead day one since falling into the Underground filled with scary monsters and a few spooky skeletons. However, much to your surprise, that did not happen (yet).
You know how you ended up here, but you don't know... HOW. You're actually in the GAME Undertale now. And to make matters worse, there are some people who KNOW. You're surviving the best you can, but things are only going to get weirder from here on out. Gaster apparently needs your help? You're using the DJ to go to different AU's? You are gay now?-
Okay, maybe that last one is just a joke, but still! You can only hope that your instincts are enough to keep you alive in these trenches. On God, they tryin' to drown you in this hoe!
{Available on Patreon, Quotev, and Ao3 under GabrielXander}