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Bill Cipher is a dream demon character who acts as a major antagonist in Disney series Gravity Falls. Since his debut appearance in the first season finale episode "Dreamscapers," the character has become one of the show's most popular characters.
Bill (voiced by Alex Hirsch) made his first appearance in the first season finale episode "Dreamscapers", which aired on July 12th, 2013. In the episode, Bill makes an agreement with another major antagonist Gideon Gleeful to invade Stanley Pines' mind and get the code to the safe containing deed to his Mystery Shack. Ultimately, his plan is thwarted by Dipper and Mabel Pines and Soos Ramirez. Since then he has appeared in the episodes Sock Opera, the Last Mabelcorn and Twins vs. the Future, his ultimate plan being invading the physical world and opening a rift to his own realm.
Ever since his first appearance, Bill Cipher has gained notable popularity among the fandom due to his twisted sense of humor and mysterious nature. Deviantart has over 16000 results related to the character.
I Know Lots of Things
"I know lots of things" is a memorable quote associated with the character. It appears in Dreamscrapers when Bill explains to Gideon how he knows his name among multiple other subjects.
Bipper is fan-given nickname to Bill Cipher posessing Dipper's body. While it has only appeared in Sock Opera, it has become relatively popular among the fandom, partially due to it's erratic behavior and masochistic tendecies.