In "The Hide-Behind," Dipper sets out to find the elusive creature in order to prove it exists. As Dipper concludes the interview with his great-uncle, the Hide-Behind makes its rattling noise and runs out from behind the Mystery Shack into the forest. After a number of hours chasing it, Dipper corners it behind a thin tree, which emits the rattling noise. After Dipper mistakes an owl with a maraca for it, he states that the Hide-Behind must be a legend and nothing more, as he walks off deeper into the forest. However, the Hide-Behind appears from behind the thin tree, and makes its rattling cry, as Dipper turns around, it hides behind larger trees, with Dipper unaware of its presence as it continues to stalk the young adventurer.
The creature is very gangly, flexible, slender, and black, with small glowing yellow eyes. Its structure is humanoid but nearly skeletal and resembles a tree. Its limbs are incredibly long, with large hands and long fingers each ending with sharp fingernails/claws.
It is flexible enough to match the trees it is hiding behind. It has the ability to change size from the height of a tree to the size of a rock.
- This creature is based on the Hidebehind, a creature from North American folklore.
- In the animated short "The Hide-Behind," Dipper's camera has captured pictures of the Hide Behind. It is unknown that Dipper left the camera in the forest by an accident or not.
- In "Into the Bunker," the Shape Shifter transformed into the Hide Behind, despite the journal having no clear photo of it.
- The Hide Behind is seen on the Gravity Falls season 2 poster.