Cthulhu, fictional entity created by fantasy-horror writer H.P. Lovecraft and introduced in his story “The Call of Cthulhu,” first published in the magazine Weird Tales in The creature is described as “a monster of vaguely anthropoid outline, but with an octopus-like head whose face was a mass of feelers, a scaly, rubbery-looking body, prodigious claws on hind and fore feet, and.