History EldritchAbomination / DoctorWho

* The Moment is one of the more understated ones and yet probably the most powerful in the series. Never mind that it's a piece of mechanics complex enough to develop a consciousness, throughout its only appearance it repeatedly and calmly punches holes in the Time Lock around the Time War. As a reminder, this is the same barrier that's strong enough to (mostly) seamlessly contain the full might of the Daleks, Time Lords, and every other EldritchAbomination they brought with them.

** [[Recap/NewSeriesAdventuresEnginesOfWar Engines of War]] reveals that the Skaro Degradations are attempts by the Time Lords to retro-engineer Dalek evolution but Dalek evolution always reasserts itself creating various different Daleks. Then, realizing that the Time Lords are [[NiceJobBreakingItHero actually doing them a favor]], take the ball and run with it, experimenting on their ''own'' degradations.

* ''AudioPlay/BigFinishDoctorWho'': Anti-Time essentially causes this. There are the Neverpeople, people who have experienced RetGone, and are left as ghosts who devour people's time.
* Then there is the being of Anti-Time, [[TheDreaded Zagreus]]

** [[Recap/NewSeriesAdventuresEnginesOfWar Engines of War]] reveals that the Skaro Degradations are attempts by the Time Lords to retro-engineer Dalek evolution but Dalek evolution always reasserts itself creating various different Daleks.

* Borusa and the other Time Lords Rassilon experimented on in [[Recap/NewSeriesAdventuresEnginesOfWar Engines of War]]. Their timelines have been retro-engineered meaning they are in a constant state of flux between their regenerations and what could have been. They can see all possible timelines and when Borusa is in the Eye of Tantalus he is able to pull on threads of possibility to bring new timelines into being.

* ''AudioPlay/BigFinishDoctorWho'': Anti-Time essentially causes this. There are the Neverpeople, people who have experienced RetGone, and are left as ghosts who devour people's time. Zagreus is the personification of Anti-Time, someone who shouldn't exist and can cancel out events.

** In ''Series/{{Torchwood}}'', we meet its spawn, who kills people with its ''shadow''.

* The Daleks certainly believe the Doctor is one. They [[RedBaron call him]] [[NamesToRunAwayFromReallyFast "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 ''[[TheDreaded fear]]'' (keep in mind they were deliberately engineered to feel nothing but hate for all things non-Dalek), and [[Recap/DoctorWhoS33E01AsylumOfTheDaleks "Asylum of the Daleks"]] shows that the few Daleks that survived encounters with him were driven almost ''[[GoMadFromTheRevelation permanently catatonic]]'' by the experience.

* The eponymous creature in ''[[Recap/DoctorWhoS15E3ImageOfTheFendahl Image of the Fendahl]]''; everyone who saw it died of fright, and that was only a crippled ghost of its true self 12 million years dead, which had been manipulating human lineages for millennia to ensure its release. In the Franchise/DoctorWhoExpandedUniverse, the Time Lords deliberately created the Fendahl Predator, a malign void which could reach across time and space to feed on the stuff of thought and hungered to [[OmnicidalManiac devour all eternity]], from the Big Bang to the end of time. Those who looked at it saw an endless procession of grotesque images, as their mind struggled to comprehend the incomprehensible. [[TooDumbToLive And then the Time Lords released it to use for warfare]] - only to find it already dead at the hands of an even ''worse'' abomination - the Memeovore, the Devourer of Concept.
** Not everyone who saw the Fendahl was lucky enough to die of fright. The Core transformed some of them into Fendahleen (the other components that, together with the Core, make up the Fendahl). The leader of the cultists who completed the process of creating the Core had worse luck than that. He was still alive, still human, and seeming still sane... but what he saw when he looked into the eyes of the Fendahl caused him to request the means to kill himself. How bad it was is evidenced by the Doctor giving him those means.
* The Beast from ''[[Recap/DoctorWhoNSS2E8TheImpossiblePlanet The Impossible Planet]]''/''[[Recap/DoctorWhoNSS2E9TheSatanPit The Satan Pit]]'', so much so that ''the Doctor refuses to understand it''.

* The eponymous BigBad in ''[[Recap/DoctorWhoS26E3TheCurseOfFenric The Curse of Fenric]]'' is described as evil incarnate from almost the beginning of the universe, albeit [[spoiler:one without a body of its own, instead possessing others' bodies]]. One of the spinoff novels identifies Fenric as [[spoiler:Hastur the Unspeakable]] from the Franchise/CthulhuMythos.
* The Franchise/DoctorWhoExpandedUniverse says the TARDIS itself is an Eldritch Abomination, which considerately disguises itself to avoid reducing the passengers to gibbering wrecks. As a living shape-shifting creature, at home in extra-dimensional spaces, with a mind even the Doctor deems unfathomably alien, it's certainly a good candidate. A minor story comments on the TARDIS' mind as completely and utterly [[spoiler:'''pandimensional''']].
** The 2011 episode ''[[Recap/DoctorWhoS32E4TheDoctorsWife The Doctor's Wife]]'' has the mind and essence of the TARDIS trapped inside a humanoid female body for a while, and it is shown to be kind and caring, and feels nothing but love for the Doctor.
* The... ''creature'' from ''[[Recap/DoctorWhoNSS4E10Midnight Midnight]]''. [[NothingIsScarier We don't see much of it]], so it's nothing definite. But it [[spoiler:{{Mind Rape}}s ''the Doctor'' and, by turning the people he's trying to save against him, comes closer to killing him than ''anything'' else.]]
-->'''Sky/Doctor''': He's waited so long. In the dark. And the cold. And the diamonds. Until you came. Bodies so hot. With blood. And pain.

** If they weren't this initially, then [[spoiler:they ''definitely'' became this during the Last Great Time War]], given the Doctor's description and the events of ''[[Recap/DoctorWhoNSS4E17E18TheEndOfTime The End of Time]]''.

* Remember the Doctor's line from ''[[Recap/DoctorWhoS31E12ThePandoricaOpens 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." [[spoiler:It's the Doctor himself.]]
* The Daleks certainly believe the Doctor is one. They [[RedBaron call him]] [[NamesToRunAwayFromReallyFast "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 ''[[TheDreaded fear]]'' (keep in mind they were deliberately engineered to feel nothing but hate for all things non-Dalek), and ''[[Recap/DoctorWhoS33E01AsylumOfTheDaleks Asylum of the Daleks]]'' shows that the few Daleks that survived encounters with him were driven almost ''[[GoMadFromTheRevelation permanently catatonic]]'' by the experience.

* Sutekh, Last of the Osirans, from ''[[Recap/DoctorWhoS13E3PyramidsOfMars Pyramids of Mars]]''. At the time, the Doctor describes him as the worst threat he has ever faced, the greatest time of peril in the history of the Earth, and given his awakening would have rendered the planet a barren wasteland before he spread across the universe to kill ''[[OmnicidalManiac everything]]'', his concern was very much justified.
* The Animus from ''[[Recap/DoctorWhoS2E5TheWebPlanet The Web Planet]]''. In the Franchise/DoctorWhoExpandedUniverse, it's actually Lloigor, one of the Great Old Ones from the Franchise/CthulhuMythos.

* The Great Intelligence, a powerful, disembodied consciousness that whispers in people's minds for years [[spoiler:or even decades]] to turn them into willing puppets, and was infrequently encountered until ''[[Recap/DoctorWhoS33E13TheNameOfTheDoctor The Name of the Doctor]]'' - in which it makes an almost successful attempt to destroy the Doctor's entire life back to even before he ever left Gallifrey. [[Recap/DoctorWhoS5E5TheWebofFear Before that,]] it attempted to steal all of the Doctor's life experiences and memories and mentally revert him back to a younger age. It manifested bizarre powers and whenever it deigned to take physical form, it could BodySurf if the body it was in was damaged. The Franchise/DoctorWhoExpandedUniverse identifies the Great Intelligence as an alias of [[spoiler:[[Franchise/CthulhuMythos Yog-Sothoth]].]]
* The House from ''[[Recap/DoctorWhoS32E4TheDoctorsWife The Doctor's Wife]]'', a [[ForTheEvulz malevolent]], [[TimeAbyss ancient]] [[GeniusLoci living asteroid]] that originally existed ''outside'' the universe ([[LiesToChildren the plug hole at the bottom of the universe]]), and '''eats [=TARDISes=]'''.
* The Old God, or "Grandfather", from ''[[Recap/DoctorWhoS33E07TheRingsOfAkhaten The Rings of Akhaten]]''. A creature so powerful even the Doctor is willing to consider it a god, which has been sung to for millennia (''constantly,'' with singers rotating in and out but the song never having been interrupted, ever) because if the songs cease for even a second, it will wake and devour all existence (oh, and [[spoiler:[[GeniusLoci it's the size of a planet]]]]). The parallels to [[Franchise/CthulhuMythos Azathoth]] couldn't be more blatant.

* AudioPlay/BigFinishDoctorWho: Anti-Time essentially causes this. There are the Neverpeople, people who have experienced RetGone, and are left as ghosts who devour people's time. Zagreus is the personification of Anti-Time, someone who shouldn't exist and can cancel out events.

** In ''Series/{{Torchwood}}'', we meet its son, who kills people with its ''shadow''.

* The Great Intelligence, a disembodied consciousness that whispers in people's minds for years [[spoiler:or even decades]] to turn them into willing puppets, and is never fought or encountered directly until ''[[Recap/DoctorWhoS33E13TheNameOfTheDoctor The Name of the Doctor]]'' - in which it makes an almost successful attempt to destroy the Doctor's entire life back to even before he ever left Gallifrey. It manifested bizarre powers and whenever it deigned to take physical form, it could BodySurf if the body it was in was damaged. The Franchise/DoctorWhoExpandedUniverse identifies the Great Intelligence as an alias of [[spoiler:[[Franchise/CthulhuMythos Yog-Sothoth]].]]

* Anti-Time essentially causes this. There are the Neverpeople, people who have experienced RetGone, and are left as ghosts who devour people's time. Zagreus is the personification of Anti-Time, someone who shouldn't exist and can cancel out events.

* Anti-Time essentially causes this. There are the Neverpeople, people who have experienced RetGone, and are left as ghosts who devour people's time. Zagreus is the personification of Anti-Time, someone who shouldn't exist.

** Not everyone who saw the Fendahl was lucky enough to die of fright. The Core transformed some of them into Fendahleen (the other components that, together with the Core, make up the Fendahl). The leader of the cultists who completed the process of creating the Core had worse luck than that. He was still alive, still human, and seeming still sane...but what he saw when he looked into the eyes of the Fendahl caused him to request the means to kill himself. How bad it was is evidenced by the Doctor giving him those means.

* The eponymous creature in [[Recap/DoctorWhoS15E3ImageOfTheFendahl ''Image of the Fendahl'']]; everyone who saw it died of fright, and that was only a crippled ghost of its true self 12 million years dead, which had been manipulating human lineages for millennia to ensure its release. In the Franchise/DoctorWhoExpandedUniverse, the Time Lords deliberately created the Fendahl Predator, a malign void which could reach across time and space to feed on the stuff of thought and hungered to [[OmnicidalManiac devour all eternity]], from the Big Bang to the end of time. Those who looked at it saw an endless procession of grotesque images, as their mind struggled to comprehend the incomprehensible. [[TooDumbToLive And then the Time Lords released it to use for warfare]] - only to find it already dead at the hands of an even ''worse'' abomination - the Memeovore, the Devourer of Concept.
** Not everyone who saw the Fendahl was lucky enough to die of fright. The Core transformed some of them into Fendahleen (the other components that, together with the Core, make up the Fendahl). The leader of the cultists who completed the process of creating the Core had worse luck than that. He was still alive, still human, and seeming still sane...but what he saw when he looked into the eyes of the Fendahl caused him to request the means to kill himself. How bad it was is evidenced by Doctor gaving him those means.
* The Beast from [[Recap/DoctorWhoNSS2E8TheImpossiblePlanet ''The Impossible Planet'']]/[[Recap/DoctorWhoNSS2E9TheSatanPit ''The Satan Pit'']], so much so that ''the Doctor refuses to understand it''.

* The eponymous BigBad in [[Recap/DoctorWhoS26E3TheCurseOfFenric ''The Curse of Fenric'']] is described as evil incarnate from almost the beginning of the universe, albeit [[spoiler:one without a body of its own, instead possessing others' bodies]]. One of the spinoff novels identifies Fenric as [[spoiler:Hastur the Unspeakable]] from the Franchise/CthulhuMythos.

** The 2011 episode [[Recap/DoctorWhoS32E4TheDoctorsWife ''The Doctor's Wife'']] has the mind and essence of the TARDIS trapped inside a humanoid female body for a while, and it is shown to be kind and caring, and feels nothing but love for the Doctor.

** If they weren't this initially, then [[spoiler:they ''definitely'' became this during the Last Great Time War]], given the Doctor's description and the events of [[Recap/DoctorWhoNSS4E17E18TheEndOfTime ''The End of Time'']].
** In the [[Franchise/DoctorWhoExpandedUniverse 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 Cthullu-mythos creatures.
* Remember the Doctor's line from [[Recap/DoctorWhoS31E12ThePandoricaOpens ''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." [[spoiler:It's the Doctor himself.]]
* The Daleks certainly believe the Doctor is one. They [[RedBaron call him]] [[NamesToRunAwayFromReallyFast "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 ''[[TheDreaded fear]]'' (keep in mind they were deliberately engineered to feel nothing but hate for all things non-Dalek), and [[Recap/DoctorWhoS33E01AsylumOfTheDaleks ''Asylum of the Daleks'']] shows that the few Daleks that survived encounters with him were driven almost ''[[GoMadFromTheRevelation permanently catatonic]]'' by the experience.

* Sutekh, Last of the Osirans, from [[Recap/DoctorWhoS13E3PyramidsOfMars ''Pyramids of Mars'']]. At the time, the Doctor describes him as the worst threat he has ever faced, the greatest time of peril in the history of the Earth, and given his awakening would have rendered the planet a barren wasteland before he spread across the universe to kill ''[[OmnicidalManiac everything]]'', his concern was very much justified.

* The House from [[Recap/DoctorWhoS32E4TheDoctorsWife ''The Doctor's Wife'']], a [[ForTheEvulz malevolent]], [[TimeAbyss ancient]] [[GeniusLoci living asteroid]] that originally existed ''outside'' the universe ([[LiesToChildren the plug hole at the bottom of the universe]]), and '''eats [=TARDISes=]'''.
* The Old God, or "Grandfather", from [[Recap/DoctorWhoS33E13TheNameOfTheDoctor ''The Rings of Akhaten'']]. A creature so powerful even the Doctor is willing to consider it a god, which has been sung to for millennia (''constantly,'' with singers rotating in and out but the song never having been interrupted, ever) because if the songs cease for even a second, it will wake and devour all existence (oh, and [[spoiler:[[GeniusLoci it's the size of a planet]]]]). The parallels to [[Franchise/CthulhuMythos Azathoth]] couldn't be more blatant.

* The Daleks certainly believe the Doctor is one. They [[RedBaron call him]] [[NamesToRunAwayFromReallyFast "The Oncoming Storm", "The Destroyer of the Worlds" and "The Predator of the Daleks"]], he's the only being in the universe they outright ''[[TheDreaded fear]]'' (keep in mind they were deliberately engineered to feel nothing but hate for all things non-Dalek), and [[Recap/DoctorWhoS33E01AsylumOfTheDaleks ''Asylum of the Daleks'']] shows that the few Daleks that survived encounters with him were driven almost ''[[GoMadFromTheRevelation permanently catatonic]]'' by the experience.

** Not everyone who saw the Fendahl was lucky enough to die of fright. The Core transformed some of them into Fendahleen (the other components that, together with the Core, make up the Fendahl). The leader of the cultists who completed the process of creating the Core had worse luck than that. He was still alive, still human, and seeming still sane...but what he saw when he looked into the eyes of the Fendahl caused him to request the means to kill himself.

* The eponymous creature in [[Recap/DoctorWhoS15E3ImageOfTheFendahl "Image of the Fendahl"]]; everyone who saw it died of fright, and that was only a crippled ghost of its true self 12 million years dead, which had been manipulating human lineages for millennia to ensure its release. In the Franchise/DoctorWhoExpandedUniverse, the Time Lords deliberately created the Fendahl Predator, a malign void which could reach across time and space to feed on the stuff of thought and hungered to [[OmnicidalManiac devour all eternity]], from the Big Bang to the end of time. Those who looked at it saw an endless procession of grotesque images, as their mind struggled to comprehend the incomprehensible. [[TooDumbToLive And then the Time Lords released it to use for warfare]] - only to find it already dead at the hands of an even ''worse'' abomination - the Memeovore, the Devourer of Concept.

* The Beast from [[Recap/DoctorWhoNSS2E8TheImpossiblePlanet "The Impossible Planet"]]/[[Recap/DoctorWhoNSS2E9TheSatanPit "The Satan Pit"]], so much so that ''the Doctor refuses to understand it''.

* The eponymous BigBad in [[Recap/DoctorWhoS26E3TheCurseOfFenric "The Curse of Fenric"]] is described as evil incarnate from almost the beginning of the universe, albeit [[spoiler:one without a body of its own, instead possessing others' bodies]]. One of the spinoff novels identifies Fenric as [[spoiler:Hastur the Unspeakable]] from the Franchise/CthulhuMythos.

** A recent episode has the mind and essence of the Tardis trapped inside a humanoid female body for a while, and it is shown to be kind and caring, and feels nothing but love for the Doctor.
* The... ''creature'' from "[[Recap/DoctorWhoNSS4E10Midnight Midnight]]". [[NothingIsScarier We don't see much of it]], so it's nothing definite. But it [[spoiler:{{Mind Rape}}s ''the Doctor'' and, by turning the people he's trying to save against him, comes closer to killing him than ''anything'' else.]]

** If they weren't this initially, then [[spoiler:they ''definitely'' became this during the Time War]], given the Doctor's description and the events of [[Recap/DoctorWhoNSS4E17E18TheEndOfTime "The End of Time"]].
** In the Extended 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 Cthullu-mythos creatures.
* Remember the Doctor's line from [[Recap/DoctorWhoS31E12ThePandoricaOpens "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." [[spoiler:It's the Doctor himself.]]
* The Daleks certainly believe the Doctor is one. They [[RedBaron call him]] [[NamesToRunAwayFromReallyFast "The Oncoming Storm" and "The Predator of the Daleks"]], he's the only being in the universe they outright ''[[TheDreaded fear]]'' (keep in mind they were deliberately engineered to feel nothing but hate for all things non-Dalek), and [[Recap/DoctorWhoS33E01AsylumOfTheDaleks "Asylum of the Daleks"]] shows that the few Daleks that survived encounters with him were driven almost ''[[GoMadFromTheRevelation permanently catatonic]]'' by the experience.

* Sutekh, Last of the Osirans, from [[Recap/DoctorWhoS13E3PyramidsOfMars "Pyramids of Mars"]]. At the time, the Doctor describes him as the worst threat he has ever faced, the greatest time of peril in the history of the Earth, and given his awakening would have rendered the planet a barren wasteland before he spread across the universe to kill ''[[OmnicidalManiac everything]]'', his concern was very much justified.
* The Animus from "[[Recap/DoctorWhoS2E5TheWebPlanet The Web Planet]]". In the Franchise/DoctorWhoExpandedUniverse, it's actually Lloigor, one of the Great Old Ones from the Franchise/CthulhuMythos.

* The House from [[Recap/DoctorWhoS32E4TheDoctorsWife "The Doctor's Wife"]], a [[ForTheEvulz malevolent]], [[TimeAbyss ancient]] [[GeniusLoci living asteroid]] that originally existed ''outside'' the universe ([[LiesToChildren the plug hole at the bottom of the universe]]), and '''eats [=TARDISes=]'''.
* The Old God, or "Grandfather", from [[Recap/DoctorWhoS33E13TheNameOfTheDoctor "The Rings of Akhaten"]]. A creature so powerful even the Doctor is willing to consider it a god, which has been sung to for millennia (''constantly,'' with singers rotating in and out but the song never having been interrupted, ever) because if the songs cease for even a second, it will wake and devour all existence (oh, and [[spoiler:[[GeniusLoci it's the size of a planet]]]]). The parallels to [[Franchise/CthulhuMythos Azathoth]] couldn't be more blatant.

* The Old God, or "Grandfather", from [[Recap/DoctorWhoS33E13TheNameOfTheDoctor"The Rings of Akhaten". A creature so powerful even the Doctor is willing to consider it a god, which has been sung to for millennia (''constantly,'' with singers rotating in and out but the song never having been interrupted, ever) because if the songs cease for even a second, it will wake and devour all existence (oh, and [[spoiler:[[GeniusLoci it's the size of a planet]]]]). The parallels to [[Franchise/CthulhuMythos Azathoth]] couldn't be more blatant.

* The eponymous creature in "Image of the Fendahl"; everyone who saw it died of fright, and that was only a crippled ghost of its true self 12 million years dead, which had been manipulating human lineages for millennia to ensure its release. In the Franchise/DoctorWhoExpandedUniverse, the Time Lords deliberately created the Fendahl Predator, a malign void which could reach across time and space to feed on the stuff of thought and hungered to [[OmnicidalManiac devour all eternity]], from the Big Bang to the end of time. Those who looked at it saw an endless procession of grotesque images, as their mind struggled to comprehend the incomprehensible. [[TooDumbToLive And then the Time Lords released it to use for warfare]] - only to find it already dead at the hands of an even ''worse'' abomination - the Memeovore, the Devourer of Concept.

* The Beast from "The Impossible Planet"/"The Satan Pit", so much so that ''the Doctor refuses to understand it''.

* The eponymous BigBad in "The Curse of Fenric" is described as evil incarnate from almost the beginning of the universe, albeit [[spoiler:one without a body of its own, instead possessing others' bodies]]. One of the spinoff novels identifies Fenric as [[spoiler:Hastur the Unspeakable]] from the Franchise/CthulhuMythos.

** If they weren't this initially, then [[spoiler:they ''definitely'' became this during the Time War]], given the Doctor's description and the events of "The End of Time".

* The Daleks certainly believe the Doctor is one. They [[RedBaron call him]] [[NamesToRunAwayFromReallyFast "The Oncoming Storm" and "The Predator of the Daleks"]], he's the only being in the universe they outright ''[[TheDreaded 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 ''[[GoMadFromTheRevelation permanently catatonic]]'' by the experience.

* Sutekh, Last of the Osirans, from "Pyramids of Mars". At the time, the Doctor describes him as the worst threat he has ever faced, the greatest time of peril in the history of the Earth, and given his awakening would have rendered the planet a barren wasteland before he spread across the universe to kill ''[[OmnicidalManiac everything]]'', his concern was very much justified.

* The Great Intelligence, a disembodied consciousness that whispers in people's minds for years [[spoiler:or even decades]] to turn them into willing puppets, and is never fought or encountered directly until ''The Name of the Doctor'' - in which it makes an almost successful attempt to destroy the Doctor's entire life back to even before he ever left Gallifrey. It manifested bizarre powers and whenever it deigned to take physical form, it could BodySurf if the body it was in was damaged. The Franchise/DoctorWhoExpandedUniverse identifies the Great Intelligence as an alias of [[spoiler:[[Franchise/CthulhuMythos Yog-Sothoth]].]]
* The House from "The Doctor's Wife", a [[ForTheEvulz malevolent]], [[TimeAbyss ancient]] [[GeniusLoci living asteroid]] that originally existed ''outside'' the universe ([[LiesToChildren the plug hole at the bottom of the universe]]), and '''eats [=TARDISes=]'''.
* The Old God, or "Grandfather", from "The Rings of Akhaten". A creature so powerful even the Doctor is willing to consider it a god, which has been sung to for millennia (''constantly,'' with singers rotating in and out but the song never having been interrupted, ever) because if the songs cease for even a second, it will wake and devour all existence (oh, and [[spoiler:[[GeniusLoci it's the size of a planet]]]]). The parallels to [[Franchise/CthulhuMythos Azathoth]] couldn't be more blatant.

* The Great Intelligence, a disembodied consciousness that whispers in people's minds for years [[spoiler:or even decades]] to turn them into willing puppets, and is never fought or encountered directly. The Franchise/DoctorWhoExpandedUniverse identifies the Great Intelligence as an alias of [[spoiler:[[Franchise/CthulhuMythos Yog-Sothoth]].]]

* The eponymous creature in "Image of the Fendahl"; everyone who saw it died of fright, and that was only a crippled ghost of its true self 12 million years dead, which had been manipulating human lineages for millennia to ensure its release. In the Franchise/DoctorWhoExpandedUniverse, the Time Lords deliberately created the Fendahl Predator, a malign void which could reach across time and space to feed on the stuff of thought and hungered to [[OmnicidalManiac devour all eternity]], from the Big Bang to the end of time. Those who looked at it saw an endless procession of grotesque images, as their mind struggled to comprehend the incomprehensible. [[TooDumbToLive And then the Time Lords released it to use for warfare.]]

* The Old God, or "Grandfather", from "The Rings of Akhaten". A creature so powerful even the Doctor is willing to consider it a god, which has been sung to for millennia because if the songs cease for even a second, it will wake and devour all existence (oh, and [[spoiler:[[GeniusLoci it's the size of a planet]]]]). The parallels to [[Franchise/CthulhuMythos Azathoth]] couldn't be more blatant.

** Not everyone who saw the Fendahl were lucky enough to die of fright. The Core transformed some of them into Fendahline (the other components that, together with the Core, make up the Fendhal). The leader of the cultists who completed the process of creating the Core had worse luck than that. He was still alive, still human, and seeming still sane...but what he saw when he looked into the eyes of the Fendahl caused him to request the means to kill himself.

* The Ancient Old Ones, beings from [[FishOutOfTemporalWater the previous universe]] that follow different physics, which allows them vast RealityWarper abilities; this can be inverted with beings from the ''next'' universe that have similar powers.

* The Old God, or "Grandfather", from "The Rings of Akhaten". A creature so powerful even the Doctor is willing to consider it a god, which has been sung to for millennia because if the songs cease for even a second, it will wake and devour all existence (oh, and [[spoiler:[[GeniusLoci it's the size of a planet]]]]). The parallels to [[Franchise/CthulhuMythos Azathoth]] couldn't be more blatant.