Lovecraft’s terrifying, almost god-like creature that has an almost “coming soon” feel to it. He is described as a truly horrible monster with a body that is a combination of an octopus, a dragon, and a human. It is said to be “dead but dreaming” in the city of R’lyeh, a place of non-Euclidean madness that is sunken in the depths of the pacific ocean.
It was said to have been a high priest of the Great old ones – unnatural alien beings who ruled the earth before humanity formed, worshiped as gods by the few misguided people. It is said that they are a horrible nightmare, and will return causing worldwide insanity and mindless violence before finally displacing humanity forever.
“While psychically sensitive humans have been contacted by Cthulhu through telepathy (which is assumed to be the “language” of the Old Ones), the only reported sighting by a human in recorded history occurred on March 23, 1925.
This was twenty-two days after R’lyeh rose above the water, only to sink once more shortly after when the merciful stars’ shifting position caused Cthulhu to resume his death (the conditions required for R’lyeh to rise are also required for the Old Ones to live). This was reported by Gustaf Johansen, the only remaining crew member of the Emma. He later died under mysterious circumstances in his hometown of Oslo.” – Urban Dictionary