GOLB

GOLB is briefly seen at the end of "Puhoy". As Finn is being warped back to his own reality, he  bounces off GOLB's tongue and into Jake's pillow fort.

Appearance
GOLB is a large red creature with four giant eyes. It a large purple tongue and over-pronounced teeth and gums. It's head is made of two geometric shapes: a cube topped by a pyramid.

Trivia

 * GOLB's name has not been stated in the show. It was revealed by Adam Muto on Formspring.
 * GOLB has a number of blocks floating around him that look similar to those seen at the end of "The Lich (episode) and " Finn the Human (episode)".