Bill Cipher

Bill Cipher is the main antagonist of the Disney XD series "Gravity Falls". He is a very powerful dream demon who means to bring about the end of the world by opening a rift between his Nightmare Realm and the real world.

He is voiced by Alex Hirsch

The Protectors of the Multi-Universe
Bill is second in command of Hera's followers. His job is to spy on the heroes and led the Protectors astray and out of the way so the villains can strike at the Children of Autobots. But throughout the series, he betrays Hera and joins Galvatron for control of the universe with the other villains.