There’s a lot of evidence pointing towards the Time Lords being an entire species of this trope, given their incredible age and intelligence, how easily and often the very laws of reality are twisted like playthings by them, and their inherent ability to perceive the universe in ways no other species can. Indeed, several of the conflicts between the Doctor and the Master play out a lot like battles in an endless war between two Eldritch Abominations, with the poor lesser beings caught between.
If they weren’t this initially, then they definitely became this during the Last Great Time War, given the Doctor’s description and the events of The End of Time. In the Expanded Universe, fighting a war even worse than the one described in the TV show, Time Lords are combat bio-engineered to regenerate into the perfect soldier for any environment. In one case, this means turning into minor Cthulhu Mythos creatures.
Remember the Doctor’s line from The Pandorica Opens about the thing the Pandorica was designed to hold: “There was a goblin, or a trickster… or a warrior… A nameless, terrible thing, soaked in the blood of a billion galaxies. The most feared being in all the cosmos. And nothing could stop it or hold it, or reason with it. One day it would just drop out of the sky and tear down your world.” It’s the Doctor himself.
The Daleks certainly believe the Doctor is one. They call him “Bringer of Darkness”, “The Oncoming Storm”, “The Destroyer of the Worlds” and “The Predator of the Daleks”, he’s the only being in the universe they outright fear (keep in mind they were deliberately engineered to feel nothing but hate for all things non-Dalek), and Asylum of the Daleks shows that the few Daleks that survived encounters with him were driven almost permanently catatonic by the experience.
“Well, you’ll remember me a little. I’ll be a story in your head. But that’s OK. We’re all stories in the end. Just make it a good one, eh? Cause it was, you know. It was the best…”
raggedy man, goodbye; a farewell mix for the eleventh doctor [LISTEN]
i. echo - jason walker | ii. human - daughter | iii. we might as well be strangers - keane | iv. someone told me - jake bugg | v. dear fellow traveler - sea wolf | vi. this is gospel - panic! at the disco | vii. til the casket drops - zz ward | viii. dust to dust - the civil wars | ix. history book - dry the river | x. the light behind your eyes - my chemical romance | xi. time of our lives - tyrone wells