Dimensions

Multiple timelines, multiple happy endings, maybe some aren't the endings you hoped for but that's alright. Everything is as it should be, peaceful, for the most part.

...But what if someone from another timeline decided they wanted to avenge a fallen friend? What if, just what if, they were being manipulated behind the scenes to destroy all worlds for one evil being? What would happen then?

Author's Note: This really is an idea I got from several good fanfictions, comic dubs, and of course from playing Undertale myself. Constructive criticism is encouraged. Undertale belongs to Toby Fox, all artwork belongs to the original artists who created the beautiful works I will use as covers for each chapter.