Cooler monster

The Cooler Monster is a creature that Dipper finds in the ice cooler at the Dusk 2 Dawn. It is unknown whether this is an independent creature or simply a creation of Ma and Pa's own design. The latter is more likely, as the cooler monster is gone when Dipper checks the ice cooler again.

History
This creature is first seen in "The Inconveniencing," when Dipper goes to get ice for Wendy's friends. It appears in the ice machine and startles him, making him drop the ice.

The Cooler monster makes an appearance in the Attic Stuff Golf online game and as an enemy in the Mystery Shack Attack game.

Appearance
It resembles a human brain with veins that form hands, two retractable stalk eyes and a mouth that looks like a pair of dentures. It is possible that the veins are actually the human nervous system, as it stems from the brain.

Trivia

 * When he was asked if the Cooler Monster's appearance would ever be explained, Alex Hirsch simply replied: "No."