The Cosmic Owl is a character of Adventure Time that first appeared in the episode "Prisoners of Love," where Ice King had a vision of it. It was seen in the episode "The New Frontier," where Jake had a dream of it. This is called a "croak dream." It is possible that it is of some religous value in Ooo, just like how Grob Gob Glob Grod is most likely Ooo's 'god.' In "Jake the Human," it is revealed that the Cosmic Owl has a friend named Prismo. It is mostly seen in the croak dreams.
The Cosmic Owl is a large owl that has a golden color all over its body. It has large eyes and large wings. It has a single colored eye.