Undertale: Disbelief (previously "Disbelief Papyrus") is a fan-made project based on UNDERTALE by Toby Fox, set in an alternative timeline. Not affiliated with Toby Fox. At a strange turn of events during an otherwise normal Genocide Route, Sans takes the place of Papyrus as the final Snowdin encounter, warning the human of the path they're on and keeping his brother out of the line of attack. Despite his efforts, he tragically fails. Soon, Papyrus finds himself alone and faced with the impossible task of stopping the human at the Last Corridor.