Demon Cat

Demon Cat is a character appearing in the Adventure Time episode "Dungeon", where he acts as the major antagonist. He is voiced by Clancy Brown.

Appearance
The Demon Cat resembles a large teal cat, with razor sharp teeth and retractable claws. Small sections of his fore and hind left legs seem to be invisible (or non-existent), and his tail seems to be made of maroon tentacles that extend from his body. The Demon Cat also seems to be able to create a lure from within his mouth that resembles the head of a kitten. He can also turn his kitten shaped tongue upside-down, probably to scare his opponents. The Demon Cat speaks with a creepy, but calm voice.

Personality
The Demon Cat seems to take great pride in his "approximate knowledge of many things"; despite the fact that he repeatedly guesses Finn's name incorrectly and was incapable of finding him in a sort of shell game after repeated tries. He also seems to enjoy toying with and tormenting his victims, announcing his intentions, movements and plans to Finn while searching for him.

It is somewhat unclear if he hunts for food, pleasure, or fights primarily as a guardian in the dungeon; claiming throughout the episode that he will eat Finn's eyes, skin him, tear out his heart, etc. He seems to have a very sadistic personality.

The Demon Cat is unafraid of adventurers, such as Finn, but is terrified of dogs, running away from the mere smell of Jake.

Dungeon
The Demon Cat is first encountered by Finn near the beginning of the dungeon, engaging in combat with Finn. Finn punches him in the face, enraging the cat and causing the yellow scleras in his eyes to turn blood red. He easily bests Finn in single combat, only to suddenly retreat when he notices the scent of Jake's odor on Finn.

After escaping the Bucket Knight, Finn lands in the Demon Cat's lair. Awaking to Finn lamenting Jake not accompanying him, the Demon Cat decides to resume his attack. Finn is forced to flee from the Demon Cat, and hides in a nearby cavern. Using his knowledge of "exactly where [Finn] might be," the Demon Cat begins searching for Finn. Fortunately for Finn, the Demon Cat's approximate knowledge is unable to pinpoint his exact location, although, with the limited number of hiding spaces within the cavern, Finn seems doomed. Only through the arrival of his "Guardian Angel" is Finn saved from the Demon Cat.

Quotes
See Demon Cat/Quotes

Trivia

 * It is likely that the Demon Cat is a parody or tribute to the Displacer Beast, a monster in Dungeons & Dragons that looks like a puma with tentacles coming out of its back and makes illusions of itself to confuse others. In this case, the Demon Cat is often misplacing others or information.
 * The Demon Cat seems to resemble the Cheshire Cat from Alice in Wonderland.
 * The Demon Cat's tongue is a parody of ridley scots Alien's tongue. When he tries to bite Finn, it is shown that his tongue is a small kitten.
 * The Demon Cat is the boss in the game "Sound Castle". He also said the Crystal Eye Dungeon to be "his" dungeon.
 * The Cat's powers of 'approximate knowledge' and his half-way made appearance could be a refernece to the philisophical paradox Schrödinger's cat, in which a cat in a box with poison is supposedly stuck in a perpetual state between life and death.