Gravity Falls Wiki
Gravity Falls Wiki

The Horrifying Sweaty One-Armed Monstrosity[2] is a creature who appears during the event of Weirdmageddon.


In "Weirdmageddon Part 1," The Horrifying Sweaty One-Armed Monstrosity encounters Dipper as he attempts to break into Gravity Malls in search of his friends. He demands that Dipper climb into his mouth, which Dipper ignores in terror, much to the monstrosity's frustration. He later appears when Wendy and Dipper are trying to avoid Gideon and his henchmen, where he eats one of the Discount Auto Mart Warriors. He also appears during the episode's end credits, still desperately trying to convince anyone to climb in his mouth. He finally gives up and drags himself offscreen, announcing that he needs to call his mother.

While Weirdmageddon was being reversed in "Weirdmageddon 3: Take Back The Falls," he was sucked back to the Nightmare Realm.


The Horrifyng Sweaty One-Armed Monstrosity appearance .png

He consists of a gigantic man's head, with a round nose, a five o'-clock shadow, thick red eyebrows, and red hair on his temples. Attached to the top of his head is a muscular arm which he uses to drag himself around.


Season 2


"Anybody wanna get in my mouth? I'm a big mo—hungry monster—I'm a big hungry monster here! I would really appreciate it, if someone—you, ma'am, you ma'am, how would you like to get in my—"
—The Horrifying Sweaty One-Armed Monstrosity during the end credits[source]


  • 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.[3]
  • All lines spoken by the monster have been redubbed by Alex Hirsch, to cut all ties the show had to Louis C.K., and all future airings will be of these versions of the episodes. The decision to redub was made over cutting the character out of all future airings. Despite the redubbing, the character still has a resemblance to C.K.
  • A large ear, large leg, and large hand were all visible during the events of Weirdmageddon, though it is unknown whether they have any relation with this creature.


Click here to view the image gallery for The Horrifying Sweaty One-Armed Monstrosity.
Click here to view this page's gallery.


  1. The monstrosity's character model
  2. The monstrosity's name in end credits
  3. Exclusive: Gravity Falls Creator Alex Hirsch on Weirdmageddon, Part 1. Disney insider. Archived from the original on November 14, 2020. 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