A strange phenomenon had happened to the people of Gravity Falls after they changed the water supply source to a cleaner lake after it had been revealed that the town lunatic, Old Man McGucket, used the old lake as a toilet and personal bathroom. Not even a week after the switch, people had clustered to the doctor complaining of stomach cramps and intense migraines, limbs that refuse to work and senses that suddenly made the world around them so overwhelming that they could do nothing but lie on the ground and sob. The very next day, every single person had transformed into a mythical beast. Well, everyone except Lilah.