Based on the Fanfiction "Doubletale" by XWolf26. If you haven't read (at least half of) Doubletale, don't read this. What if when Cter fell to the underground, he accidentally fell into his least favorite AU, Underfell. Join Cter as he fights to end the AU, and watch the battle of DETERMINATION unfold. This is my first fanfic. Paranoid rating (ish).