Sans thought it was finally over, but it had really only just begun. Something dark lies; something he forgot, and it's only a matter of time before old memories, and old purposes, are revived. When a happy ending is all at once a nightmare, Frisk and her friends are faced with either saving a dear friend, or saving the world. And saving both might not be an option.

What if Pitch's defeat was a ruse? What if he took advantage of their lowered guard and attacked? What if he shot Jack? Poisoned by the sand of fear, the winter spirit falls into a deep coma. The only way to save him is for them to go inside his mind; giving the Guardians a front row seat to all the pain he has been through. AU Movie Ending.