The Fall of the Underground

A Gravity Falls (Specifically Bill Cipher) X Undertale Crossover

A.N: This story could possibly considered an AU but it's more of just an idea that was stuck in my head for a while now and maybe writing an actual story will help me get it out of my head. Now, Some backstory, this story takes place a year before the actual game happens and at this time Alphys is at her lowest point and is desperate to either connect with someone or solve her problems. She has been too scared to talk to Undyne and feels betrayed by how selfish Mettaton was for abandoning her in his pursuit of fame. Also in this story Bill Cipher was stopped by the Zodiac Circle instead of the mind ray, which makes it that instead of being erased he was actually just sent back to the mindscape instead.

The Underground

It was an average day for everyone in the underground. Toriel wandering the ruins, Sans and Papyrus was on some wacky journey, Undyne was doing her guard duty and monster kid was just watching, Mettaton performing, and Asgore sitting on his throne. But the one person who was not having a good day, was Alphys. Alphys was on verge of a mental breakdown. She had been driven mad with guilt and loneliness. First her friend Mettaton refuses to even speak with her, then she is too shy to talk to Undyne, and finally her biggest problem… The amalgamates. She had been trying to figure every which way to fix them, to save them, but all of them failed. The constant flow of letters didn't help her psyche at all either. Alphys could only sigh with disappointment. She has however had one thing to help her coup. Her collection of anime. Whenever she would feel as if she was about to breakdown or feel too crippled to move she could always count on the japanese cartoons to at least distract her from the problems, and on this particular day she had ran out of new episodes to watch and with her not wanting to deal with her problems she had chosen to look at the garbage dump in hopes of finding a new dvd.

When she walked out the door she made her way to the mysterious hooded rower. The man simply looked at her and she answered, "Take me to waterfall… p-please!" Alphys told the hooded figure. The hooded figure started to row and began singing to himself, he knew Alphys wasn't much of a talker so it would be a waste of time to try to. It only took a few minutes to get to waterfall and to the trash dump. Alphys was unsure where to start looking and simply randomly started to dig through the closest trash pile. She seemed to search for hours when she finally stumbled upon a black rectangle. When Alphys saw the shape she nearly ripped it from underneath the entire pile of trash but she calmed herself enough to simply pull it out slowly. She hurriedly opened it but was stopped cold after realizing what it really was. It was a completely charcoaled book that had all the pages burned beyond comprehension, or so it seemed. Alphys flipped through all the pages and was surprised on what she found toward the middle of it. It was a single, intact page. It was labeled: "Summoning" and a triangle man with a top hat and little arms next to it. The description stated: Bill Cipher, a powerful being with a knowledge of a great many things. When summoned he will offer deals to help the summoner with anything. Alphys stopped reading after that, she felt something she hasn't felt in a long time. Hope.

A.N: Please review this story if you want to see more of it, I'll try to update every weekend and if I'm not lazy I might even update it during the weekdays.