Bill Cipher

Bill Cipher is an invincible Dream Demon that appears in the Disney XD show "Gravity Falls." Bill is capable of high-level trickery and deceiving and is the main antagonist of Gravity Falls.

Season 1
S01E19 Dreamscaperers

Season 2
S02E4 Sock Opera

S02E15 The Last Mabelcorn

S02E18 Weirdmageddon 1

S02E19 Weirdmageddon 2: Escape from Reality

S02E20 Weirdmageddon 3: Take Back the Falls

Pre-Stanford Pines
Bill Cipher is mentioned to be trillions of years old. Sometime around 1000 A.D. he tricked a shaman named Modoc. It is presumed that he has tricked many more people before the beginning of Gravity Falls.

Stanford Pines
Sometime during 1981 an investigator of the strange named Stanford Pines recited an ancient incantation found in a cave. That afternoon, while taking a nap, Stanford had a dream that Bill visited him in. Stanford made a deal with Bill that said he could enter his mind when his eyes were shut. Bill used him to create a portal to his dimension by lying that the weirdness of Gravity Falls came through a tear in the dimensional rift. Stanford believed him and built a machine that punctured a hole into Bill's dimension.

Dreamscaperers
Gideon, who Bill describes as a "living ventriloquist dummy," makes a deal with him so Bill gets the code to the safe in the Mystery Shack and Gideon helps Bill with something he does not mention. Bill enters Stanford's brother Stanley's mind to search for the code. Bill repeatedly runs into Dipper, Mabel, Soos, Xyler, and Craz, and has to trick them into giving him the safe. Dipper finds out you can be anything you want in the Mind Scape, and Dipper's flying and laser vision and Mabel's cat-shooting arms defeat Bill and suck him back into his own dimension.

Sock Opera
Bill Cipher takes over Dipper's mind by tricking him into giving him "just a puppet." Bill does all kinds of horrible things to Dipper's body such as sticking forks in his eyes, tumbling down the stairs, and blinking one eye at once. Eventually, during the sock puppet opera Mabel was doing, Mabel defeats Bill.

The Last Mabelcorn
While Mabel, Candy, Grenda, and Wendy hunt for unicorn hair, Stanford attempts to "Bill-proof" Dipper's mind. But during the process of that, Stanford falls asleep, and Dipper looks through Stanford's thoughts. Dipper sees that Stanford and Bill used to work together and falsely believed they were still working together. Dipper tries to shoot the memory gun at Stan, but realizes that Stanford and Bill are now archenemies.

The Weirdmageddon Trilogy
Bill is the main antagonist of this series and takes over Gravity Falls. He creates a prison bubble for Mabel, which Dipper, Wendy, and Soos take her out of. Bill is eventually defeated by Stanford and Stanley switching clothes and letting Bill into Stanley's mind, then using the memory gun on him. Currently Bill is sealed (permanently?) in Stanley's mind.