Bad Time Trio is a boss found in the Alternate Universe Bosses and is fan made from an actual game which has Bad Time Trio's brothers and the Alternate versions of sans. Anyways there is three phases. There is a phase where the enemy is Sans, Story Shift Chara, and Underswap Papyrus. In the second phase Underswap Papyrus and Story Shift Chara are the only remaining. In phase three Chara is the only one left and has a giant Chara smile.