In Gravity Falls lore, the Theraprism is meant to rehabilitate the deceased, but, by his own admission, Bill Cipher shows no signs of changing. During one of his therapeutic arts-and-crafts ...

The main antagonist of Gravity Falls, Bill Cipher is a bizarre interdimensional demon.Once summoned, the one-eyed, top hat-wearing triangle can take over a person's mind. Two seasons into Gravity ...

At one point, a baby even touched Bill’s hand, which is how Bill Cipher makes his deals, something that inspired some pretty great fanart. Bill made a lot of deals that night.

Alex Hirsch talks about Bill Cipher, Summerween, Gravity Falls, and which character deserves a 50 Shades of Gray-style spinoff. The Book of Bill is out now.

Gravity Falls’ big villain, Bill Cipher, is getting his own book written by series creator, Alex Hirsch. And it’s for older readers! Out in July.