Pacifica asks for help.png
I need your help.
This article is a stub. You can help the Gravity Falls Wiki by expanding it.

The Horrifying Sweaty One-Armed Monstrosity[1] is a creature that came into Gravity Falls through Bill Cipher's rift in the sky.


In "Weirdmageddon Part 1," The Horrifying Sweaty One-Armed Monstrosity is one of the monsters that inhabits Gravity Falls during Weirdmageddon. He encounters Dipper as he attempts to break in to the Gravity Falls Mall in search of his friends. He demands that Dipper climbs into his mouth, which Dipper ignores in terror, much to the Monstrosity's frustration. He also appears during the episode's credits, still desperate to convince anyone he can to climb into his mouth.


  • Louis C.K., the creature's voice actor, improvised most of his role during the end credit scene of "Weirdmageddon Part 1" where he says, "I gotta call my mother." In fact, there is nearly 30 minutes of him improvising different ways the monstrosity could beg someone to get into his mouth.[2]
  2. Exclusive: Gravity Falls Creator Alex Hirsch on Weirdmageddon, Part 1 (HTML). Disney insider. Retrieved on October 28, 2015. “...We have nearly 30 minutes of just him improvising different ways a monster could beg someone to get into his mouth.”

Site navigation

Community content is available under CC-BY-SA unless otherwise noted.