Cthulhu

Cthulhu is a monster.

History
In a short film, said that Mr. Burns combines the ancient evil of Cthulhu with the trim physique of Slender Man.

Non-canon
In the town of Fogburyport, the Simpsons were to take part in an eating contest, except this turned out to be a ruse to get sacrifices for Cthulhu. When Cthulhu was about to eat Homer, Homer challenged him to an eating contest. Cthulhu started to struggle and decided to go for a walk before falling over, leaving Homer as the winner. Homer was then allowed to name his prize, and chose to have him and his family eat Cthulhu.