Zanthar, also known as The Being Whose Name Must Never Be Said, is an interdimensional criminal from an unknown dimension who is a member of Bill Cipher's gang.
History
Background
Eons before the events of the series, Zanthar indulged in criminal activities before being called together by Bill Cipher, along with the rest of his gang.[3] At one point, during a major conflict between the Time Baby and Bill, Zanthar punched the latter with enough force to send him out of the Nightmare Realm which is infinite and exists among all universes, with an infinite number of universes in Gravity Falls, and crashed directly into the Earth of dimension 46, creating a shockwave that boiled the oceans and caused the extinction of the dinosaurs.
Season 2
Zanthar with the rest of Bill's gang as Weirdmageddon begins.
In "Weirdmageddon Part 1," during the cold open, Bill introduces Zanthar with the rest of his friends to the residents of Gravity Falls. Afterwards, on Main Street, Zanthar and the other demons watch Bill turn Ford into a lifeless golden statue and taunt Dipper before burning the journals. Later in the episode, Zanthar is seen playing "Spin the Person" and enjoying the "V.I.P." party Bill is having at the Fearamid until Time Baby and the Time Paradox Avoidance Enforcement Squadron crash the party. To the demons' delight, Bill vaporizes Time Baby and his squadron. The party then continues as Zanthar and the other demons rejoice over Time Baby's presumed death.
In "Weirdmageddon 2: Escape From Reality," Zanthar and the rest of Bill's minions attempt to leave Gravity Falls and spread their chaos across the world, but are stopped by an invisible barrier. They are later subjected to Bill's rage over their inability to leave.
Zanthar against the Shacktron.
In "Weirdmageddon 3: Take Back The Falls", Zanthar participated in the fight against the Shacktron, during which he rammed the gigantic robot, only for it to toss him into the mountains, leaving behind only his party hat. He was then sucked back into the Nightmare Realm along with his comrades following Bill's defeat.
Appearance

Zanthar is a large and primitive demon with a body similar to that of a loaf of bread and the limbs of an ape. He has dark grey-purple skin with some darker spots and is faceless, in place of a face is a light grey-purple patch of countershading that resembles a loaf's crumb and has some dark grey-purple spots flecked against it. Zanthar additionally has small conifer trees and patches of moss-like vegetation growing out of his back, shoulders and other areas. His only attire is a lavender-blue party hat that has a lone purple stripe going diagonal across its surface and a yellow pom-pom on top.
Sightings
Season 2
- 218. "Weirdmageddon 1: Xpcveaoqfoxso" (no lines)
- 219. "Weirdmageddon 2: Escape From Reality" (no lines)
- 220-221. "Weirdmageddon 3: Take Back The Falls" (no lines)
Trivia
- In concepts, Zanthar was going to look similar to an island, having things such as a house and a river on his back.[4] His features are vaguely reminescent of the Island Head Beast, a gigantic and monstrous disembodied head covered with trees.
- Zanthar and 8 Ball are the only Henchmaniacs that are not seen after the fight with the Shacktron.
- His size varies across his appearances during Weirdmageddon, at times he is the largest of all of the Henchmaniacs, while in other times 8 Ball surpasses his height with raised arms.
Gallery

Click here to view this page's gallery.
References
- ↑ "Weirdmageddon 2: Escape From Reality." Jeff Rowe & Alex Hirsch (writers) & Matt Braly (director). Gravity Falls. Disney XD. November 26, 2015. No. 19, season 2.
- ↑ 2.0 2.1 2.2 "Weirdmageddon 1: Xpcveaoqfoxso." Josh Weinstein, Alex Hirsch (writers) & Sunil Hall (director). Gravity Falls. Disney XD. October 26, 2015. No. 18, season 2.
- ↑ 3.0 3.1 Disney Insider (October 27, 2015). Exclusive: Gravity Falls Creator Alex Hirsch on Weirdmageddon, Part 1. Archived from the original on November 12, 2015. Retrieved on October 27, 2015. “... Bill has spent eons amassing criminals and lunatics from different [italic added] dimensions...”
- ↑ Xanthar's concept art