Bill Cipher is the main antagonist of Gravity Falls, the Disney animated series that ran from 2012 to 2016 and was created by Alex Hirsch, who also voiced Bill. The one eyed dream demon made deals, possessed characters and treated reality as a joke, quickly becoming the show's most quoted villain. Clips of his threats spread on YouTube, TikTok and soundboards long after the finale, helped by fan theories and the lasting cult following around the show's mysteries, codes and Weirdmageddon arc.