Now grown, Frisk's top priority is monsterkind. She'd do anything for them, but Sans is tired of the resets and her working herself to death. When she starts receiving odd messages, Sans is flung into messed up worlds and meets a ghost from his past he'd kill to forget. All he knows is he has to save his wife. Dr. Gaster is not to be trusted after all. UF, US and other AUs featured