LIST OF DOCTOR WHO MONSTERS AND ALIENS

This is a 'list of monsters and aliens' from the television series ''Doctor Who''. The list includes some races which are not extraterrestrial, but are nonetheless non-human. This list is meant to cover alien races and species of monsters, not specific characters. Individual characters are listed in separate articles.

A

Aggedor

:''Main articles: The Curse of Peladon, The Monster of Peladon''

Alpha Centauri

:''Main articles: Alpha Centauri, The Curse of Peladon, The Monster of Peladon''

Alzarian

:''Main article: Full Circle''

Androgum

Main articles: The Two Doctors

Anethan

Main articles: The Horns of Nimon

Anti-Man

Main articles: Planet of Evil

Arcturus

Main articles: The Curse of Peladon

Argolin

The 'Argolin', who appeared in the Fourth Doctor story ''The Leisure Hive'' (1980) by David Fisher, are the inhabitants of Argolis. In 2250, the Argolin, led by Theron, fought and lost a 20-minute nuclear war with the Foamasi. As a result of this war, the Argolin became sterile. They were also quite long-lived, but when they neared the end of their life they aged and declined very rapidly. The Argolin who survived the war put aside their race's traditional warlike ways and remade Argolis as "the first of the leisure planets", catering to tourists from many worlds. They built a "Leisure Hive" dedicated to relaxation and cross-cultural understanding; due to radioactive fallout from the war, the Argolin planned to live in the Hive for at least three centuries. Argolis continued to struggle financially, and by 2290 faced possible bankruptcy. A rogue faction of Foamasi known as the West Lodge attempted to purchase the entire planet to use as a criminal base, sabotaging recreation facilities in order to encourage the Argolin to sell. The criminal nature of the offer was exposed by a Foamasi agent, aided by the Fourth Doctor and Romana.
Since the Argolin were sterile, they attempted to renew their race using cloning and tachyonics, but only one of the clones, Pangol, survived to adulthood. Pangol was mentally unstable and obsessed with the Argolin's former warrior culture. He attempted to create an army of tachyonic duplicates of himself, but was unsuccessful and was eventually restored to infancy through the same tachyonic technology that had created him.
In appearance, Argolin are humanoids with yellowish skin. Their heads are covered with what appears to be elaborately coiffed hair, but may not be (since when Pangol is reduced to infancy he retains the distinctive Argolin hairstyle). Their heads are capped with small domes covered in beads, which fall off when the Argolin become sick or die.

Aridian

:''Main article: The Chase''

Axos

Main articles: The Claws of Axos

Auton

Main articles: Auton

:''See also: Spearhead from Space, Terror of the Autons, Rose,'' Love & Monsters (cameo)

B

Bandril

Main articles: Timelash

Bannerman

Main articles: Delta and the Bannermen

Brain of Morphoton

Main articles: The Keys of Marinus

C

Carrionite

The 'Carrionites', as seen in "The Shakespeare Code" (2007), are a race of witch-like beings, bound to Earth and desperate to begin their new empire. They use advanced science which appears much like magic and voodoo. Unlike humans, who use numbers, maths and science to advance and split the atom, the Carrionites use words to manipulate the universe and defy physics. In the "old" times of the universe, they were banished through powerful words by the Eternals, but three were later freed by William Shakespeare's words in a period of madness following the loss of his son, Hamnet. They attempted to use the Globe Theatre to amplify a "spell" which would free the rest of the Carrionites and return the universe to the ways of "blood and magic", but were banished once more by Shakespeare's words. In Tudor London before the Carrionites were brought onto the Earth there were only three Carrionites. They were Lilith, Mother Doomfinger and Mother Bloodtide. The species come from the "Fourteen Stars of the Rexel Planetary Configuration".

Castrovalvan

Main articles: Castrovalva

Cat

By the time of "New Earth", felines, referred to exclusively as "'Cats'", have evolved into humanoids. They are capable of interbreeding with the humans of the future. The cats have claws to defend themselves as shown by Matron Casp. They also have other feline characteristics such as slitted eyes and flat noses. Thomas Kincade Brannigan, a cat-person who has interbred with a human, has quadrupedal kittens which resemble modern kittens; humanoid features emerge after ten months into feline maturation.^[1] One of the kittens is able to pronounce the word 'Mama', however.
Cats act like humans for the most part, and vary in personality. However, they maintain a somewhat haughty attitude towards other people. 'The Sisters of Plenitude' were Cat People who worked in a hospital near the city of New New York.

Chameleon

Main articles: The Faceless Ones

Cheetah Person

:''Main article: Survival''

Chelonian

The 'Chelonians' are a race of cybernetic humanoid tortoises who have appeared in various spin-off novels. The first appearance of the Chelonians was in the Seventh Doctor Virgin New Adventures novel ''The Highest Science'' by Gareth Roberts. They returned in ''Zamper'' and also featured in the Fourth Doctor missing adventure ''The Well-Mannered War''; as well as in the short stories ''The Hungry Bomb'' and ''Fegovy'', both by Gareth Roberts and published in the ''Doctor Who Magazine Yearbook 1995'' and the anthology ''Decalog 3: Consequences'', respectively.
The Chelonians are a war-like race from the planet Chelonia. They are hermaphroditic and lay eggs. Some of their cybernetic enhancements include X-ray vision and improved hearing. Chelonians consider humans to be parasites and often try to eliminate them. There is a pacifistic faction, however, and at some point following the Doctor's recorded encounters with them, this took control and the society began devoting its energies towards flower arrangement.

Chimeron

Main articles: Delta and the Bannermen

Chronovore

Main articles: The Time Monster

Chula

:''Main articles: The Empty Child, The Doctor Dances''

Cryon

Main articles: Attack of the Cybermen

Cyberman

Main articles: Cyberman

Cybermat

:''Main article: Cybermats''

D

Dalek

Main articles: Daleks

Delta Magnan

Main articles: The Power of Kroll

Demon

'Demons' have appeared in ''Doctor Who'' several times. Originally in Third Doctor serial ''The Dæmons'', in which they were specifically aliens from the planet Dæmos who had come to Earth in the distant past and ingrained their existence as myth, with "demon" Azal summoned at the Master's will.
In 2006, both the Tenth Doctor series of ''Doctor Who'' and its spin-off ''Torchwood'' expanded upon a notion of actual malicious supernatural entities existing in the ''Doctor Who'' universe. "The Impossible Planet" introduced the Beast, a Satan-like demon remaining from the universe before our own, sealed away in planet Krop Tor by the "Disciples of Light". Later, the ''Torchwood'' episode "End of Days"', the mysterious Bilis Manger frees "Abaddon, son of the great Beast" from within the Rift, where he like the Beast had been imprisoned since "before time". Earlier in the first series of ''Torchwood'', demonic supernatural entities referred to by humans as "fairies" were established in "Small Worlds" as a non-alien presence on Earth since before mankind came to exist

Destroyer

:''Main article: Battlefield (Doctor Who)

Didonian

:''Main article: The Rescue''

Dominator

Main articles: The Dominators

Draconian

:''Main article: Draconian''

Dragon

Main articles: Dragonfire

Drahvin

Main articles: Galaxy 4

Drashig

Main articles: Carnival of Monsters

Dulcian

Main articles: The Dominators

E

Elder

:''Main article: The Savages''

Eternal

'Eternals', as seen in ''Enlightenment'' (1983), are beings who live in the "trackless wastes of eternity", as opposed to the likes of the Doctor and his companions who are "Ephemerals". Eternals use Ephemerals for their thoughts and ideas. The Eternals have lived for so long that they are unable to think for themselves and need human minds to give them existence, and entertainment; as such, they use human crews on their ships. Eternals seek out "Enlightenment", the wisdom to know everything. They are aware of the Void, calling it "the Howling" ("Army of Ghosts" (2006)) and were responsible for banishing the Carrionites ("The Shakespeare Code" (2007)).
An article by Russell T. Davies in the ''Doctor Who Annual 2006'' states that during the Time War between the Time Lords and the Daleks, the Eternals (one of the Higher Species who were aware of the war's presence and its outcomes) fled the Doctor's reality in despair, never to be seen again.
A group of Eternals who had taken the role of gods to the ancient Gallifreyans were recurring characters in the Virgin New Adventures. The most notable were Time, Death and Pain, and the Seventh Doctor was "Time's Champion".

Exxilon

Main articles: Death to the Daleks

F

Face of Boe

Main articles: Face of Boe

:''See also: The End of the World, New Earth, Gridlock''

Fish Person

Main articles: The Underwater Menace

Flesh/New Humans

The 'Flesh' were a group of human clones used by the Sisters of Plenitude for the development of cures for the people of New Earth, as seen in "New Earth" (2006). They were initially seen incarcerated in pods, but after their release by Lady Cassandra, they began infecting patients in the hospital. Cured of their diseases by the Doctor, they were named as a new race entirely: 'New Humans'.

Foamasi

The 'Foamasi' are an intelligent, bipedal race of reptiles who appeared in the 1980 Fourth Doctor story ''The Leisure Hive'' by David Fisher. The race's name is a near-anagram of the word "mafioso". The Foamasi fought and won a 20-minute nuclear war with their sworn enemies, the Argolin. They communicate by means of chirps and clicks, this being made understandable by means of a tiny interpreting device held in the mouth. Although they are mostly a peaceful race (having learned the error of their ways from the devastating war) a renegade faction called the West Lodge exists, and frequently attempts to arouse hostilities between the two races.
Since their victory, the Argolin's home planet of Argolis has been officially owned by the Foamasi government. However, the Foamasi are the only ones who would want it as, being reptiles, they can safely walk on the radioactive surface of the planet. Two saboteurs from the West Lodge (disguised as the Argolin agent Brock and his lawyer Klout) arrive to try to force the Argolins to sell the Leasure Hive to them, so they can use it as a new base for their insidious plans. However they are thwarted when a group of Foamasi, one claiming to be a member of the Foamasi government, use a web-spewing gun to ensnare them and return them back to their unnamed home planet to face justice. Some Foamasi disguise themselves as humanoids by fitting into skin-suits which are smaller than the Foamasi's own bodies. This discrepancy is not explained (although the Slitheen family used a compression field to fit inside smaller skins, compared to their own body size).
A Foamasi assassin appears in the Eighth Doctor Adventures novel ''Placebo Effect'' by Gary Russell. In this novel, it is explained that the Foamasi can fit into disguises smaller than their bodies because their bones are hollow and collapsible.

Forest of Cheem

The 'Forest of Cheem' are an intelligent, bipedal, arboreal species that are direct descendants of the tropical rainforest. The forest were sold to the Brotherhood from the Panjassic Asteroid field, who experimented on the trees, and, after hundreds of years the trees grew arms and started walking. One night, the entire race of Trees got on their Barkships after they heard the Great Calling, traveling through space for five thousand years. The word 'cheem' means 'water' in the forest's language. Members of the Forest of Cheem appear in the Ninth Doctor episode "The End of the World" by Russell T. Davies. According to the Ninth Doctor, they are of huge financial importance due to their land holdings and forests on various planets; and they have "roots" everywhere. They have a noble bearing and exhibit a respect for all forms of life. The group of Trees seen on ''Platform One'' was led by Jabe Ceth Ceth Jafe (named in ''Doctor Who: Monsters and Villains''), and also included Coffa and Lute.
They neither respect nor understand technology, referring to computers as "metal minds" or "metal machines", being intelligent and unneedy of electricity. They were also aware of the Time Lords and their fate in the Time War. The ''Doctor Who Annual 2006'' classifies them as one of the higher species who were aware of the course of the war and its history-changing effects and also states that they were mortified by the bloodshed.
Coffa and Lute appear again in the comic strip story "Reunion of Fear" in ''Doctor Who - Battles in Time'' #6.

Futurekind

The Futurekind are a barbaric humanoid race with pointed teeth and primitive language skills, who appear in the 2007 episode "Utopia", set in the year 100 trillion when the universe is coming to an end. The human survivors describe the Futurekind as what they may become if they do not reach 'Utopia'. The Futurekind are seen to be aggressive towards normal humans, hunting any they find.

G

Garm

:''Main article: Terminus''

Gastropod

The 'Gastropods', as seen in ''The Twin Dilemma'' (1984) are a race of giant slugs who kidnapped two maths geniuses to pilot their planet into a sun, creating an explosion that will scatter their eggs across the universe.

Gaztak

Main articles: Meglos

Gel Guard

Main articles: The Three Doctors

Gelth

The 'Gelth' appeared in the Ninth Doctor episode "The Unquiet Dead". They were a new race of alien villains that the Ninth Doctor and Rose Tyler encountered in the 2005 series. They were also the first element of the new series that attracted attention for being "too scary". Following complaints (many of which were made by Mediawatch UK), the BBC stated that in future, episodes of that nature would be forewarned by a statement of "may not be suitable for under 8s".
The Gelth were intelligent gaseous lifeforms, blue and spectral in nature, who claimed to have lost their corporeal forms as a consequence of the Time War. They arrived on Earth via the spacetime rift at an undertaker's house in 1869 Cardiff and proceeded to take possession of recently-deceased corpses. Their forms could not be maintained for long in Earth's atmosphere and they required a gaseous medium to sustain them — gas from decomposing bodies or coal gas in the gas pipes common to Victorian era households.
Claiming to be on the verge of extinction, the Gelth convinced the Doctor to aid their entrance into our plane of existence via Gwyneth, the undertaker's servant girl who had developed psychic powers due to growing up near the rift. The Gelth proved instead to number in the billions and intended to take the Earth by force and murder its population to provide vessels for themselves. Ultimately, the Gelth were thwarted when Gwyneth sacrificed herself, blowing up the building and sealing the rift. Whether all the Gelth that had entered our world perished as well is unclear.
The scar left by sealing of the rift continued to emit radiation into the 21st century. It appeared in the episodes "Boom Town" and "Utopia" when the TARDIS parked on top of it to refuel. The Rift features in the spin-off series ''Torchwood'', in which it continues to serve as a bridge between Earth and other worlds, through which aliens and other associated debris come through.

GENIE

The GENIEs ((Genetically Engineered Neural Imagination Engines) are artificial life forms developed by a scientist working in artificial reality. They resemble a cross between a small dragon and a Platypus ensconced in a box, and are capable of altering reality and perception according to people's desires, whether spoken or thought. Lacking free will, they are thus compelled to grant "wishes", potentially causing disruption when in the presence of human beings. To date, their only appearance is in BBC Books novel ''The Stone Rose''.

Giant Maggot

Main articles: The Green Death

Giant Spider of Metebelis Three

Main articles: Planet of the Spiders

Gond

Main articles: The Krotons

Graske

Main articles: Attack of the Graske

Great Vampire

Main articles: State of Decay

Guardian

:''Main articles: White Guardian, Black Guardian''

H

Haemovore

'Haemovores' appeared in the Seventh Doctor story ''The Curse of Fenric'' (1989) by Ian Briggs. Vampiric creatures that fed on blood, they were the end result of human evolution in a possible far future, caused by millennia of pollution. As part of his final game against the Doctor, the entity known as Fenric transported the most powerful Haemovore (called the "Ancient One") through time to Viking Age Northumbria. There it waited, trapped beneath the North Sea for centuries, occasionally drawing victims into the water and transforming them into Haemovores.
Soon after the transformation, victims appeared much as they did in life, except for elongated fingernails and a corpse-like pallor. Later they became deformed blue-grey humanoids covered in octopus-like suckers. The Ancient One was the least human in appearance; in its own time, it was the last living thing on Earth.
During World War II, Fenric released the Ancient One. Fenric's plan was that the Ancient One was to release the toxin which would pollute the world and thus create its own future.
The Haemovores had the ability to hypnotically paralyse their victims so they could feed and drain them of blood. Not all of their victims were turned into Haemovores, although the selection process was never explained. The Haemovores were impervious to most forms of attack, surviving being shot at close range by a sub-machine gun at one point. They could be destroyed in the traditional vampire-killing fashion of driving a stake through their chests. They could also be repelled by their victim's faith, which formed a psychic barrier, like the Doctor's faith in his companions, Ace's faith in the Doctor, Captain Sorin's faith in the Communist Revolution, and even the Reverend Wainwright's failing faith in God.
Ultimately, the Seventh Doctor convinced the Ancient One to turn against Fenric, and it released the toxin within a sealed chamber, destroying itself and Fenric's host. Whether this means that the future the Ancient One came from was averted is not clear, although the Doctor seemed to think so.

Horda

Main articles: The Face of Evil

I

Ice Warrior

Main articles: Ice Warrior

:''See also: The Ice Warriors, The Seeds of Death, The Curse of Peladon, The Monster of Peladon''

Isolus

The 'Isolus' are empathic beings of intense emotion that first appeared in "Fear Her" (2006); when their spores are birthed from their mother, their need for each other sustains them for the thousands of years they need to grow to maturity. Each Isolus travels inside a pod, riding the heat and energy of the solar tides, and use their ionic power to create virtual worlds to play in, feeding off each other's love.
The ionic power of an Isolus to create these virtual worlds can bring inanimate objects like drawings to life, as well as transform living things into drawings. Even when reduced to inanimate forms, those transformed appear to be capable of limited movement and can, to an extent, communicate with the outside world.
The Isolus can also draw power from others' emotions, and even when dormant the Isolus pod absorbs all the heat it can. In the episode, the emotions surrounding the passage of 2012 Olympic Games torch were enough to recharge the Isolus pod and send it on its way back into deep space.

J

Jacondan

Main articles: The Twin Dilemma

Jagaroth

The 'Jagaroth' are an ancient and extinct race of aliens introduced in the Fourth Doctor serial ''City of Death''. The Doctor remarked that the Jagaroth were “a vicious, callous, warlike race whom the universe won't miss.” The story reveals that life on earth moved from being amino acids in a primordial soup to functioning cells because a Jagaroth space ship exploded on earth 400 million years ago.
The sole surviving Jagaroth, Scaroth, manipulated human civilization to advance the species technologically, in an effort to eventually create a time machine which he could use to prevent the initial explosion.

Judoon

The 'Judoon' are a fictional extraterrestrial race of mercenary police featured in the episode "Smith and Jones" (2007). They are basically humanoid in form, have heads that look like that of a rhino, and wear black, bulky armour with heavy boots.
They serve the role of galactic police. Brutal in their application of the law, they are highly logical in their battle tactics, but not very intelligent, and as a result can be tricked by a more intelligent individual. They have no jurisdiction on Earth, and no authority to deal with human crime, so when a fugitive alien hid out in an Earth hospital they transported the building to the moon. The Judoon carry energy weapons which can easily incinerate humans. In the hospital the Leader is the only one seen to remove his helmet.
During the episode, the Doctor demonstrates considerable knowledge of their intelligence and methods, and says that, whilst their behaviour is, on the surface, that of a military police force, they are little more than "interplanetary thugs". Also, according to The Doctor, the Judoon have a "great big lung reserve", meaning either their lungs are huge, or they have huge secondary lungs for storing air.
In a later interview David Tennant commented that the name Judoon and the fact that the episode they appear in is set on the moon is an in-joke from the scriptwriters. As David naturally has a Scottish accent one of the harder sounds to pronounce with an English accent is the 'oon' sound at the end of both words, including the line "a judoon platoon upon the moon".
The Judoon are to feature in 2008's Quick Reads release ''Revenge of the Judoon''.^[2]

K

Kaled

Main articles: Kaled

Karfelon

Main articles: Timelash

Kastrian

Main articles: The Hand of Fear

Kinda

:''Main article: Kinda''

Kraal

Main articles: The Android Invasion

Krillitane

The 'Krillitanes' are an alien race that first appeared in the 2006 episode "School Reunion". They had infiltrated the Deffry Vale comprehensive school on present day Earth, increasing the intelligence of the pupils with Krillitane oil. Using the children as part of a giant computer programme, they hoped to crack the secrets of the Skasis Paradigm, the Universal Theory that would give them control over the basic forces of the universe and turn them into gods. Their scheme was foiled by the Tenth Doctor and his companions, though not before they attempted to ask the Doctor to join them in remaking the universe. This conversation showed that the Krillitanes were aware of the Time War, of the Time Lords and of their fate. This ruse failed as miserably as the main plot of the Krillitanes.
The Krillitanes are a composite race who pick and choose physical traits they find useful from the species they conquer, incorporating them into their own bodies. When the Doctor last encountered them they looked like humans with very long necks, but by the time of "School Reunion", they possessed a bat-like form which they obtained from the conquest of Bessan ten generations prior. However, they were able to maintain a morphic illusion of human form, which could be discarded if needed.
A side effect of their rapid evolution made the very oil they were using to enhance the intelligence of Deffry Vale's children toxic to their own systems, reacting with them like an acid. As bat creatures, they sleep in a way similar to Earth bats, hanging from a ceiling with wings covering their bodies. Like Earth bats, they are sensitive to loud or high frequency noises, as demonstrated when they were temporarily disabled by the school's fire alarm. They are also carnivorous and have no qualms in devouring other sentient lifeforms for food.
In Episode 6 of BBC One sitcom ''Outnumbered'', seven-year-old Ben refers to the Krillitanes as "Krillitaney-bat-thingy from ''Doctor Who''".
The bat-like Krillitanes bear some resemblance to the Malevilus, powerful aliens who established a Roman Empire on a parallel Earth that eventually conquered the galaxy, from the ''Doctor Who Weekly'' comic strip story ''Doctor Who and the Iron Legion'' (DWW #1-#8).

Kroll

Main articles: The Power of Kroll

Kroton

Main articles: The Krotons

:''See also: Kroton (Cyberman)''

Krynoid

The 'Krynoids' appeared in the 1976 Fourth Doctor story ''The Seeds of Doom'' by Robert Banks Stewart. They are a highly dangerous, sentient form of plant life which are renowned amongst galactic botanists. They spread via seed pods which travel in pairs and are violently hurled through space by frequent volcanic eruptions on their unnamed home planet. The pods when opened are attracted to flesh and are able to infect and mingle their DNA with that of the host, taking over their body and slowly transforming them into a Krynoid. The species can also exert a form of telepathic control over other plant life in the surrounding area, making it suddenly dangerous and deadly to animal-kind. In the later stages of development the Krynoid can also control the vocal cords of its victims and can make itself telepathically sympathetic to humans. Fully grown Krynoids are many meters high and can then release hordes of seed pairs for further colonisation.
Two pods arrived on Earth at the South Pole during the prehistoric Pleistocene era and remained dormant in Antarctica until discovered at the end of the twentieth century. One of them hatched after being exposed to ultra-violet light, and took control of a nearby human scientist. The Fourth Doctor intervened in the nick of time and ensured the Krynoid was destroyed in a bomb, but the second pod was stolen and taken to the home of millionaire botanist Harrison Chase in England. Chase ensured the germination of the second pod, which overtook his scientific adviser Arnold Keeler, and transformed its subject over time into a virtually full-sized Krynoid. Unable to destroy the creature by other means – and with the danger of a seed release imminent from the massive plant – the Doctor orchestrated an RAF bombing raid to destroy the creature before it could germinate.

L

Lakertyan

Main articles: Time and the Rani

Logopolitan

Main articles: Logopolis

Lurman

:''Main article: Carnival of Monsters''

M

Macra

The 'Macra' first appear in the 1967 Second Doctor story ''The Macra Terror'' by Ian Stuart Black. They are an intelligent, giant crab-like species from an unnamed planet colonised by humanity in the future. The Macra invade the control centre of the colony and seize the levers of power without the colonists — including their Pilot — knowing what had happened. Thereafter the Macra only appear at night, when the humans are in their quarters, observing a curfew. They have strong hypnotic powers which alter human perception. They also have the ability to ensure messages are vocalised through electronic apparatus such as television or sensor speakers. Both these tools are used to keep the human colonists under control, believing they are blissfully happy. This provides a cover for the Macra to use the colonists as miners in a vast gas mine. The gas is deadly to the miners but vital to the Macra, enabling them to move more quickly and rejuvenating their abilities. The Second Doctor effects a revolution on the Macra planet and helps engineer an explosion in the control centre, destroying the Macra in charge.
The Macra also feature in the 2007 episode "Gridlock", becoming the only one-off opponent of the Doctor in the classic series to appear in the revived series so far. In the episode, some Macra are found to be alive below New New York, a city of New Earth. They live in the thick fog of exhaust gases on the main motorway under the city, tracking the flying cars by their lights and snatching at them when they get too close. The Doctor says that the species is billions of years old and once developed a mighty empire as "the scourge of this galaxy", but the Macra beneath New New York must have devolved into nothing more than beasts. The status of the Macra beyond "Gridlock" is yet to be seen.

Malmooth

The 'Malmooth' are a race of humanoid insects native to the planet Malcassairo, who are all but extinct by the year 100 trillion. The last surviving member of their race, 'Chantho', played by Chipo Chung, appears in "Utopia". A devoted assistant to Professor Yana for 17 years, when the Professor is revealed to be the Master and proceeds to turn on the Doctor and his companions, Chantho threatens to kill him. He electrocutes her, but she manages to shoot him before dying, forcing him to regenerate.
A feature of Chantho's speech is that she starts and ends her sentences with "chan" and "tho", respectively. She considers it "rude" to do otherwise, tantamount to swearing.
Physical features of the Malmooth include an insectoid exoskeleton and mandibles, and the ability to survive by drinking their own internal milk.

Mandragora Helix

Main articles: The Masque of Mandragora

Mandrel

Main articles: Nightmare of Eden

Marshman

:''Main article: Full Circle''

Marshspider

:''Main article: Full Circle''

Megara

Main articles: The Stones of Blood

Megropolis

Main articles: The Sun Makers

Menoptra

The 'Menoptra' (spelled 'Menoptera' in the novelisation of the serial) appeared in the First Doctor story ''The Web Planet'', by Bill Strutton (1965). They are an intelligent, bipedal insectoid species from the planet Vortis. In appearance, they resemble a cross between giant butterflies and bees, with each Menoptra possessing four large wings. They have yellow and black stripes around their bodies and appear to be around six feet tall, but do not seem to have typical insect body parts (such as mandibles or an abdomen).
Peaceful and kindly by nature, the Menoptra move in a unique, stylised way and their vocal inflections are stilted. They were very welcoming of the First Doctor, Ian, Barbara, and Vicki; but showed an animosity towards their fellow insectoids, the Zarbi, as well as an abhorrence for the Animus, a hostile alien intelligence that had taken over the originally passive Zarbi and almost all of Vortis. Once it was clear that the Doctor was willing to help them defeat the Animus, they were only too glad to assist in any way they could.
The assumption is that once the Animus was defeated, the Menoptra, Zarbi and the rest of the inhabitants of Vortis were able to live together in peace.

Mentiad

Main articles: The Pirate Planet

Mentor

The 'Mentors' are an amphibious race native to the planet Thoros Beta. They have two arms but no lower limbs, and speak to other species through a translation device worn around their necks. The most notable of the Mentors is Sil, whom the Sixth Doctor and Peri encountered first on the planet Varos in ''Vengeance on Varos'', and then again on Thoros Beta in ''Mindwarp''. Both stories were written by Philip Martin. Other Mentors include Lord Kiv (portrayed by Christopher Ryan), their leader. Typical Mentor business practice includes arms dealing and slave trading. They are somewhat like the Ferengi which they pre-date, in that all they care about is profit.

Minyan

:''Main article: Underworld''

Mire Beast

:''Main article: The Chase''

Mogarian

Main articles: Terror of the Vervoids

Monoid

:''Main article: The Ark''

Morestran

Main articles: Planet of Evil

Morlox

Main articles: Timelash

Morok

Main articles: The Space Museum

Moxx of Balhoon

The 'Moxx of Balhoon', as seen in "The End of the World" (2005) played by Jimmy Vee, was a small blue humanoid who moved about on a gravity chair. He was representing the solictors "Jolco and Jolco" at the end of the Earth. He is seen discussing a 'Bad Wolf scenario' with the Face of Boe. The Moxx died in the heat of the Sun's expansion. A picture of him appeared in the diary of John Smith in the series three episode "Human Nature".

Myrka

Main articles: Warriors of the Deep

N

Naglon

:''Main article: The Paradise of Death''

Navarino

Main articles: Delta and the Bannermen

Nestene

Main articles: Nestene

:''See also: Spearhead from Space, Terror of the Autons, Rose''

New Human

:''Main article: Flesh''

Nimon

Main articles: The Horns of Nimon

O

Ogri

Main articles: The Stones of Blood

Ogron

Main articles: Ogron

:''See also: Day of the Daleks, Frontier in Space''

Ood

The 'Ood' are a humanoid species with coleoid tentacles on the lower portions of their faces. In the distant future, the Ood are a slave race to humanity, performing menial tasks, and it is claimed that every human has an Ood servant. The Ood offer themselves for servitude willingly, having no goals of their own except to be given orders and to serve. It is also claimed that they cannot look after themselves, and if they do not receive orders, they pine away and die. However, mention is made of a group called the "Friends of the Ood" who are apparently lobbying for Ood freedom.
The Ood require a translator device, a small sphere connected to their "mouths" by a tube, to facilitate speech between them and humans. There appears to be no gender differentiation among the Ood, and they say they require no names or titles as they are "one", but they do have designations such as "Ood 1 Alpha 1". The Ood are empaths, sharing among themselves a low-level telepathic communication field, rated at "Basic 5" (with "Basic 30" being the equivalent of screaming and "Basic 100" meaning brain death).
According to the Official Doctor Who Annual 2007 the Ood live on a planet in the Horsehead Nebula where they were governed by a Hive Mind but it was destroyed by Human colonists. According to the monster book ''Creatures and Demons'', published in 2007, it says they come from the "Ood Sphere", close to the "Sense Sphere" planet, home to the Sensorites, who share a similarity with the Ood. With no hive mind the Ood offered themselves to the Human colonists and became a slave race.
When encountered by the Tenth Doctor and Rose Tyler in "The Impossible Planet", a large number of Ood accompanied a human-led expeditionary force on the planet Krop Tor, orbiting a black hole. The empathic nature of the Ood seemed to make them susceptible to psychic possession by the Beast, who formed the Ood on the base into his "Legion". While possessed, the Ood 'zapped' and killed two human security guards by throwing their translation spheres at them.
The Ood were defeated when Danny Bartok, the expedition member in charge of them, broadcast a telepathic flare which reduced their field to "Basic Zero", creating a "brainstorm" which caused them to collapse. However, the telepathic field began to reassert itself after a time. When Krop Tor was sucked into the black hole, the Doctor was unable to save any of the Ood on the base, who had been freed of the Beast's control, and all of them perished. It is unknown if the Ood on Earth, which were seen in "The Impossible Planet"'s Tardisode, were influenced by the Beast's control, or not.
The Ood will be returning in the 2008 story "Planet of the Ood".^[3]

Optera

The 'Optera' appeared in the First Doctor story ''The Web Planet'' by Bill Strutton. These caterpillar-like creatures were once Menoptra, but they elected to instead burrow under the ground and abandon the world of light and flight above. It is implied that they may have been driven there by the malevolent Animus.
They have larger eyes than their Menoptra brethren, and have no wings. However, they have numerous arms and appear to "hop" in a stylised way (although whether or not they actually have legs is unclear). They speak with inflection different to that of their bee-like cousins, but their speech is a strange dialect of the language of the "upper world" and words and phrases they have coined for themselves (for example, when they refer to how they plan to dig a hole in a wall they say, "We shall make a mouth in it.")
At the story's end, the Animus is defeated and the Optera are persuaded to return to the surface, where they look forward to their children learning the joys of flight; implying that once back on the surface the Optera will redevelop wings. It is assumed that all of species indigenous to Vortis are now living peacefully together.

Osiran

Main articles: Pyramids of Mars

P

Pakhar

The 'Pakhar' are an alien race from the planet Pakha, resembling metre-high hamsters. They were introduced in Gary Russell's Virgin New Adventures novel ''Legacy''. The Pakhar are generally a peaceful, if rather excitable, race, and Pakha is a centre of tourism and trade for the Galactic Federation. A planetary survey describes the planet and its people as "in every sense of the word, ''nice''", although individual Pakhar have been known to become criminals. The pollen of Earth flowers has a hallucinogenic effect on them, sometimes causing them to become violent.
The main Pakhar to appear in the book is Ker'a'nol, a reporter for GFTV, nicknamed Keri. She is possibly based on Australian ''Doctor Who'' novelist Kate Orman (described as "a fiery Pakhar" in the acknowledgments). In her second appearance, in ''Happy Endings'' by Paul Cornell, the similarity of the name "Keri Pakhar" to Kerry Packer (another Australian) is noted.
The Pakhar (including Keri) have also been featured in the Big Finish audios ''Buried Treasures'', ''Bang-Bang-a-Boom!'', ''The Goddess Quandary'' and ''The Crystal of Cantus''.

Pel

:''Main articles: The Curse of Peladon, The Monster of Peladon''

Pig Slave

In "Daleks in Manhattan" and "Evolution of the Daleks" (2007), the Cult of Skaro experiments on humans and turn them into 'Pig Slaves' if they present a low level of intelligence. The Pig Slaves took people down into the sewers of Manhattan for the Daleks to experiment on in the basement of the Empire State Building. Some pigs hide in a Broadway theatre that Tallulah, a showgirl, performs at. Tallulah later sees her lost boyfriend, Laszlo, played by Ryan Carnes, unbeknown to Tallulah kidnapped by a Pig Slave and left half-pig half-man after escaping from the Daleks. Post-mutation, Laszlo still retains some of his memory. He leaves a single white rose for Tallulah in her dressing room each night before her performance and is able to resist the Daleks, unlike the other mutants.They are extremely aggressive and savage creatures, and according to Laszlo, capable of slitting a throat with their bare teeth.
The Torchwood Institute website states that 1930s New York suffered an infestation similar to the Weevil infestation of Cardiff in the late 2000s, and that it was covered up by rumours of sewer crocodiles.^[4] This may refer to New York's Pig Slave infestation.

Plasmavore

:''Main article: Smith and Jones''

Primord

:''Main article: Inferno''

Proamon

Main articles: Dragonfire

Q

R

Raak

The 'Raak' was a sea monster experimented on by Crozier in ''Mindwarp'' (1986).

Racnoss

The 'Racnoss' appeared in the Tenth Doctor story "The Runaway Bride" in 2006.
The Racnoss were an ancient race of aliens from the Dark Times of the universe. Half-humanoid, half-arachnid in appearance, they were an invasion force who consumed everything on the planets they conquered (they were always insatiably hungry, even at the moment of birth). Their race was wiped out by the Fledgeling Empires, including (and judging by the Empress's anger and fear at the mention of Gallifrey, in particular) the ancestors of the Time Lords, over 4.6 billion years ago. Nearly all of the survivors of the race escaped in their ship to where the Earth would later form, serving in place of a planetesimal as its core, hibernating for billions of years, with the exception of their Empress. She would later come to Earth in her ship, the Webstar, seeking to use the Huon particles which had been recreated by the Torchwood Institute as a means of resurrecting her "children" before feasting on the human population of Earth. The last Racnoss were wiped out when the Doctor drained the waters of the Thames down the shaft leading to their ship; the Empress was killed when her own ship was destroyed by the army at the order of Mr Saxon.

Raxacoricofallapatorian

Main articles: Slitheen

:''See also: Aliens of London, World War Three, Boom Town, Attack of the Graske''

Reaper

'Reapers' appeared in the Ninth Doctor episode "Father's Day", written by Paul Cornell. Although not named on screen, they were referred to as "Reapers" in the publicity material for the episode. The production team based their design on the Grim Reaper, with their tails shaped like scythes.
Reapers are multi-limbed, flying reptiles similar to pterosaurs, with a large wingspan, sharp teeth both in the form of a beak and a secondary mouth in their torsos, coupled with a rapacious attitude. The Reapers are apparently extradimensional, materialising and dematerialising out of the spacetime vortex. They are attracted to temporal paradoxes that damage time, like bacteria swarming around a wound. They then proceed to "sterilise" the wound by consuming everyone in sight.
Once in this dimension, however, they can be blocked by material barriers. The older the barriers, the more effective they are, but even the oldest of barriers cannot stop them forever. Paradoxes can also allow them to directly materialise at the spot of the paradox. If the timeline is restored, they vanish, with their actions reversed as if they had never happened.
In "Father's Day", the Doctor explained that when the Time Lords were still around, there were laws to prevent the spread of paradoxes and that such paradoxes could be repaired. This implies that the Reapers are a natural phenomenon whose manifestation could be prevented if the paradox was resolved quickly. However, with the elimination of the other Time Lords in the Time War, there was no longer any agency that could repair time.
The Reapers are reminiscent of the Vortisaurs of the Big Finish Productions audio plays, the Hunters of the Virgin New Adventures novel ''The Pit'' by Neil Penswick, and the depiction of the Chronovores (first featured in ''The Time Monster'') in Cornell's own novel ''No Future''.

Refusian

:''Main article: The Ark''

Remotes

The remotes feature in the BBC Books novel ''The Deviant Strain''. Resembling gelatinous blue blobs, they are remote drones of a spaceship from the Arcane Collegiate, which crashes into Earth centuries prior to the twenty-first, sent out to collect energy for its power banks by methods which include draining human life force. They are vulnerable to sudden shifts in temperature, which can overload their ability to transmit energy to the ship.

Rill

Main articles: Galaxy 4

Rutan

Main articles: Rutan Host

:''See also: Horror of Fang Rock''

S

Sand Beast

:''Main article: The Rescue''

Savage

:''Main article: The Savages''

Scarecrow

:''Main articles: Human Nature and The Family of Blood''

Sea Devil

Main articles: Sea Devil (Doctor Who)

:''See also: The Sea Devils'', ''Warriors of the Deep''

Seaweed Creature

Main articles: Fury from the Deep

Selachian

The 'Selachians' were created and used exclusively by Steve Lyons in two Second Doctor novels, ''The Murder Game'' and ''The Final Sanction''. They had an aquatic respiratory system, highly developed linguistic skills, and spacefaring technology. They were a mercantile race not naturally given to xenophobia. However, centuries of being the objects of sport hunting made them wary of at least some races who breathe air. This gradually emphasized their latent aggression, revealing a deadly form of siege mentality. In time, they began to take decisions on the basis of what would allow them to defend through strength. For this reason, they eventually came to attack humans — a race with whom they had traditionally enjoyed a mutually beneficial trading relationship — because they saw a human colony on Terra Alpha as a potential threat.

Sensorite

Main articles: The Sensorites

Shalka

:''Main article: Scream of the Shalka''

Shrivenzale

Main articles: The Ribos Operation

Silurian

:''Main article: Silurian''
:''See also: Doctor Who and the Silurians'', ''Warriors of the Deep''

Sisterhood of Karn

Main articles: The Brain of Morbius

Skonnan

Main articles: The Horns of Nimon

Slitheen

Main articles: Slitheen

:''See also: Aliens of London, World War Three, Boom Town, Attack of the Graske''
The Slitheen are a family of massive, bipedal extraterrestrials. They are creatures of living calcium, hatched from eggs and native to the planet Raxacoricofallapatorius. While, strictly speaking, the name "Slitheen" refers to a specific family, the term has been used by the Doctor to refer to the Raxacoricofallapatorian race in general.

Slyther

The 'Slyther' was a monster that served the Daleks. It was seen in Episodes Four and Five of ''The Dalek Invasion of Earth'' (1964), guarding the Dalek mines in Bedfordshire. After the Slyther attacked a small group of humans, killing Ashton, Ian hit it with a rock, causing it to fall down a pit to its death.

Solonian

Main articles: The Mutants

Sontaran

Main articles: Sontaran

:''See also: The Time Warrior, The Sontaran Experiment, The Invasion of Time, The Two Doctors''

Spiridon

The 'Spiridons' featured in the serial ''Planet of the Daleks'' (1973). They were the dominant species of sentient humanoids on planet Spiridon in the Ninth System. They had developed a form of invisibility but became visible after death. They had been subjugated, to be used as experimental subjects and slaves, by the Daleks who were attempting to discover the secret of the Spiridons' invisibility and reproduce it for their own use. Some of the Spiridons, including one called Wester, resisted. They wore furs to keep themselves warm. The Doctor returns to Spiridon in spin-off audio adventure ''Return of the Daleks''.

Stigorax

Main articles: The Happiness Patrol

Swarm

Main articles: The Invisible Enemy

Swampie

Main articles: The Power of Kroll

Sycorax

The 'Sycorax' first appeared in the debut Tenth Doctor story, ''The Christmas Invasion'', in 2005.
The Sycorax appear to be skinless humanoids wearing mantles of bone, usually keeping their features concealed under helmets. They are proficient in the use of weapons like swords and whips, the latter which can deliver an energy discharge that disintegrates the flesh of its target. Their language is called Sycoraxic. The Sycorax also appear to have technology that is either disguised or treated as magic, referring to "curses" and the Doctor's regenerative abilities as "witchcraft". The Sycorax leader referred to an "armada" that they could use to take Earth by force if the blood control failed. They also appear to have a martial society, with traditions of honourable combat.
According to a write-up by Russell T. Davies on the BBC website, the Sycorax (whose individual lifespan is over 400 years) originated on an asteroid in the distant JX82 system, known as the Fire Trap. They were uplifted when a spaceship crashed on their asteroid and the Sycorax Leader enslaved the survivors, forcing the aliens to teach them about their technology. The asteroid was then retrofitted into the first of many spaceships, which the Sycorax then used to raid other planets, becoming feared interstellar scavengers (this reputation is made clear in their attitude to other 'inferior' races. The Sycorax leader comments to Rose that he would not 'dirty his tongue' with her language, and their translated word for 'human' can also be taken to mean 'cattle'). Their armada is permanently in orbit around the Jewel of Staa Crafell.
In ''The Doctor Who Files'' books, the name of the Sycorax homeworld is given as "Sycorax". It is unclear if this is another name for the Fire Trap.
Furthermore, after the destruction of the Fire Trap, the Sycorax spread further through the galaxy, and like humans are one of three species that continually survive and adapt, even unto the End of the Universe.
The name Sycorax is used in William Shakespeare's play ''The Tempest'', a witch who was the mother of the beast Caliban. It is also the name of one of the moons of Uranus, all of which are named after Shakespearean characters. The Shakespearean name is referenced in the third series episode ''The Shakespeare Code'' when the Doctor finds a horse's skull in The Globe's prop cupboard. He comments that it "Reminds [him] too much of the Sycorax". Shakespeare remarks he likes the sound of the word, obviously then going on to use it in ''The Tempest''.
According to the BBC website, the Sycorax facial structure was inspired by the skull of a horse

T

Taran beast

Main articles: The Androids of Tara

Terileptil

The 'Terileptils' appeared in the Fifth Doctor serial ''The Visitation'' by Eric Saward. They are a reptilian humanoid species, they cannot survive long without breathing soliton gas, which is highly combustible when combined with oxygen. As an advanced society, they enjoy a heightened appreciation of both aesthetics and warfare, and have been known to employ bejeweled androids. Criminal punishment in Terileptil society includes life imprisonment working in tinclavic mines on the planet Raaga, often with sub-standard medical care.
In 1666, a group of Terileptil prison escapees hidden near London attempted to use a genetically enhanced version of the Black Plague to destroy humanity. The destruction of their lab in Pudding Lane - with a little help from the Doctor - causes the Great Fire of London.
The Terileptils destroyed the Sonic Screwdriver which did not appear again until the Doctor Who TV Movie and it is now used regularly in the new series.
According to the Virgin Missing Adventures novel ''The Dark Path'' by David A. McIntee, by the 34th century, their homeworld Terileptus is a member of the Galactic Federation, and a noted builder of starships. A Terileptil also appears as the chief engineer on a Federation starship. The planet is destroyed during the events described in the novel; however, as with all spin-off media, the canonicity of this information is uncertain.

Terradonian

:''Main article: Full Circle''

Tetrap

The 'Tetraps' are a bat-like race from the planet Tetrapyriarbus. A pack of Tetraps was employed by the Rani to help defend her Giant Brain in the Seventh Doctor's debut story, ''Time and the Rani'' (1987) by Pip and Jane Baker. The Rani armed a pack of Tetraps for this purpose and used them as general henchmen to terrorise the native Lakertyans.
Tetraps have four eyes, one on each side of their head, giving them all-round vision, and put this to good use in stalking fugitives. Like bats, they sleep by hanging upside-down in a cavern. They feed off a dark red-coloured sludge that the Lakertyan leader releases down a chute into a trough.
Tetraps possess limited intelligence, but they soon realise that the Rani's plans would have them all killed on Lakertya. This is confirmed when their leader, Urak, hears of her plans and she later leaves him to guard over her laboratory rather than take him with her in her TARDIS, thus condemning him to death. Urak and the enraged Tetraps capture the Rani in her ship and take her back to their home planet, to force her to help solve their natural resource shortages.

Thal

:''Main article: Thal''
:''See also: The Daleks, Planet of the Daleks, Genesis of the Daleks''

Tharil

Main articles: Warriors' Gate

Tigellan

Main articles: Meglos

Time Lord

Main articles: Time Lord

The Time Lords are a group of humanoids, originating on the planet Gallifrey. The female members of this group, such as Romana, are sometimes called Time Ladies. Time Lords are so called because they are able to travel in and manipulate time through technology to a far greater degree than any other civilization.

Toclafane

The 'Toclafane' (roughly, French for "Fool the Fan")^[5] are the last remnants of humanity from the year 100 trillion. Originally intending to travel to Utopia, the last refuge of a dying universe, they find nothing but "the dark and the cold" of space. With nothing else left, they turn on themselves, cannibalising their own bodies to create a new cyborg race. As part of this process they regress into little more than children (for example, when one is asked why they would kill their own kind, it responds, "Because it's fun") with shared memories. The name Toclafane is given to them by the Master, who takes it from the Gallifreyan equivalent of the bogeyman.
The cyborg forms of the Toclafane possess energy devices capable of disintegrating targets and are equipped with numerous retractable blades. The first four also exhibit apparent teleportation abilities, not displayed by others of their race. All that remains of their bodies are barely recognisable human faces wired into the roughly basketball-sized mechanical spheres.
In "The Sound of Drums"/"Last of the Time Lords", the Master rescues four Toclafane from the end of the universe, using them to fake a first contact situation in order to draw the world's leaders into one place for easy capture. He then uses a "paradox machine" to summon six billion more. The machine also allows them to kill their ancestors without damaging the timeline, and thus establish the Master's rule over Earth. After subduing Earth, the Master aims to establish a new Time Lord empire with himself as the leader and the Toclafane as his people and ground troops. This plan is foiled when the paradox machine is destroyed, causing time to rewind and trapping the Toclafane back at the end of the universe.

Tractator

Main articles: Frontios

Trakenite

Main articles: The Keeper of Traken

Trion

Main articles: Planet of Fire

Tythonian

Main articles: The Creature from the Pit

U

Urbankan

Main articles: Four to Doomsday

Usurian

The 'Usurians' from the planet Usurius are a species that abandoned military conquest in favour of economic conquest. They enslaved humanity after their engineers made Mars suitable for human habitation, humans having depleted the Earth's resources. Once humanity had depleted Mars's resources as well, the Usurians engineered Pluto so that humans could inhabit it. They created six artificial "Suns" around it and installed the Collector, seen in ''The Sun Makers'', to oversee the collection of taxes from their human workforce. They intended to abandon Pluto and leave humanity to become extinct once the humans had exhausted its resources, there being no economically viable planet to relocate humanity to once more. The humans on Pluto revolted against the Collector and seized control of Pluto. The revolutionaries intended to relocate to Earth as the Doctor assured them it would have regenerated in their absence.
The Usurians have knowledge of the Time Lords, graded as "Grade 3" in their "latest market survey", considering it to be of low commercial value. Usurians can adopt a humanoid form but in their natural state they resemble seaweed. Shock can force them to revert to their natural form.

V

Validium

Main articles: Silver Nemesis

Vampire

:''Main article: Vampire''
:''See also: State of Decay''

Vanir

:''Main article: Terminus''

Vardan

Main articles: The Invasion of Time

Varga plant

The 'Varga plants' (sometimes 'Vaarga') appeared in the First Doctor episode "Mission to the Unknown" and the serial ''The Daleks' Master Plan'', which were essentially a prologue and main epic respectively. They were created by Terry Nation.
Varga Plants grew naturally on the Daleks' homeworld, Skaro, and when the Daleks set up a base on the planet Kembel they brought some Varga plants with them to act as sentries in the jungle surrounding their base. They were suited to this as they could move around freely by dragging themselves along with their roots.
Varga plants resemble cacti; they are covered in fur and thorns. Anyone pricked by a Varga thorn will be consumed by the urge to kill, while simultaneously becoming a Varga plant themselves.
This grisly fate happened to astronauts Jeff Garvey and Gordon Lowery, and their commander, Marc Cory, was forced to kill them.
The plants later made an appearance in the Big Finish audio ''. In this, it was revealed that the Varga plants were one of the oldest species on Skaro, but for most of their history had been immobile. Since the start of the Kaled-Thal war however, exposure to radiation and chemical weapons had caused them to rapidly evolve into a much deadlier form, capable of self-locomotion. It was this discovery that caused Davros to become interested in genetically engineering creatures in order to create weapons of war.

Varosian

Main articles: Vengeance on Varos

Venom Grub

Main articles: The Web Planet

Vervoid

Main articles: Terror of the Vervoids

Virus

Main articles: The Invisible Enemy

Vogan

Main articles: Revenge of the Cybermen

Voord

Main articles: The Keys of Marinus

Vortisaur

:''Main article: Storm Warning''

W

Waterhive

The 'Waterhive' is the description given to an unnamed alien race from the New Series Adventures novel ''The Feast of the Drowned''. They are composed of water (much like the Gelth are gaseous) and can take over the body of a drowned being. The body is thus preserved, although the eyes of their host will become "pearly", forcing glasses to be worn. They infiltrated the high ranks of the Navy in order to send sailors and their loved ones to their watery graves.

Weeping Angels

The 'Weeping Angels' are a group of psychopathic hunters featured in the Tenth Doctor episode "Blink". Because their physiology is quantum-locked (see Schrödinger's Cat), they turn to stone when observed, covering their eyes with their hands and arms to prevent themselves looking at each other: this gives the impression that they are 'weeping'. This acts as a defence mechanism; they cannot be killed while petrified (though equally they cannot kill). They can move with great speed, being fast enough to move across a street in a single blink of the eye.
According to the Doctor, the Angels are as old as the universe (or very nearly) but no one really knows where they come from. He also describes them as "creatures of the abstract", "the lonely assassins", and "the only psychopaths in the universe to kill you nicely", because their method of "killing" doesn't do anything of the sort: a touch sends their victims into the past to live out their lives before they were even born; the Angels then feed on the "potential energy" of the lives their victims would have lived in the present.
In "Blink", a quartet of Weeping Angels strand the Doctor and his companion Martha Jones in the year 1969, and attempt to feed off the vast potential energy reserves of the TARDIS. Despite dispatching the Doctor, the Angels fail to get into the TARDIS; though they get the key, they can't find the machine itself. Sally Sparrow takes the key from one of them while it is in stone form, leading them to stalk Sally to regain it. During their pursuit, Sally inadvertently leads them to the TARDIS. Eventually the four Angels, having surrounded the TARDIS, are tricked into looking at each other when the box disappears, leaving them locked in their stone forms.

Werewolf

:''Main article: Werewolf''
:''See also: The Greatest Show in the Galaxy, Tooth and Claw''

Wirrn

The 'Wirrn' are an insectoid race that made their debut in the 1975 Fourth Doctor story ''The Ark in Space''. The name is sometimes spelled 'Wirrrn', which is a spelling originating from the novelisation of the story.
The Wirrn claim to have originated from Andromeda (whether they meant the galaxy, the constellation, or even a planet named "Andromeda" is unclear), but were driven into space by space settlers. They are dark green and wasp-like in appearance and live mostly in space, although their breeding colonies are terrestrial. Their bodies are a self-contained system, their lungs being able to recycle waste carbon dioxide and only needing to touch down occasionally on planetary bodies for food and oxygen. The Wirrn's life cycle involves laying their eggs in human hosts, the larvae emerging to consume the host and absorbing their memories and knowledge. A Wirrn larva is like a green slug-like creature, sometimes a few inches across, and sometimes 1 or 2 meters. A grown Wirrn can also "infect" another person through contact with a substance it excretes, mutating them into another Wirrn and connected to their hive mind.
In ''The Ark in Space'', the Wirrn found Space Station Nerva in orbit around an Earth devastated centuries before by solar flares. The survivors had lain in suspended animation waiting for the planet to recover but had overslept by several millennia. They intended to use the sleepers as a food source and claim the empty Earth for their own, infecting Nerva's leader, Noah. However, Noah's human side reasserted itself and led the Wirrn into Nerva's transport ship even though he knew it was rigged to explode. It did so, ending the Wirrn threat.
The Wirrn have also appeared in the Eighth Doctor Adventures novel ''Placebo Effect'' by Gary Russell, and in the audio play ''Wirrn: Race Memory'', produced by BBV. A dead Wirrn appears briefly in ''The Stones of Blood''.

Wolfweed

Main articles: The Creature from the Pit

X

Xeraphin

The 'Xeraphin' were an ancient species encountered by the Fifth Doctor in the story ''Time-Flight'' by Peter Grimwade. Originating from the planet Xeriphas, they possessed immense psychokinetic and scientific powers. The Doctor believed the race to have been wiped out during the crossfire during the Vardon/Kosnax war. Instead, the entire race fled to Earth in an escaping spacecraft. The ship crashed near present day Heathrow some 140 million years ago. When the Xeraphin emerged they built a Citadel to mark their new home but the Xeraphin were so plagued with radiation that they abandoned their original humanoid bodies and transformed into a single bioplasmic gestalt intelligence within a sarcophagus at the heart of the Citadel.
The arrival of the Master coincided with their emergence from the gestalt state when the radiation effects had subsided, and his influence caused the emergence of a split personality of good and evil, each side competing for their tremendous power while yearning to become a proper species once again. The Master, who was stranded on Earth at the time too, succeeded in capturing the Xeraphin as a new power source for his TARDIS. However, the Doctor's intervention meant his nemesis' TARDIS was sent to Xeriphas where events became out of his control.
Before fleeing Xeriphas and the Xeraphin, the Master took with him Kamelion, a Xeraphin war weapon with advanced shape-changing abilities dependent on the will of its controller. Kamelion was freed from the Master and joined the Doctor's TARDIS crew in ''The King's Demons''.

Xeron

Main articles: The Space Museum

Y

Yeti

Main articles: The Web of Fear

Z

Zarbi

The 'Zarbi' appeared in the 1965 First Doctor story ''The Web Planet'' written by Bill Strutton, and are an (ant-like) insectoid species, with some characteristics associated with beetles, from the planet Vortis, which were controlled by the power of the Animus. They are roughly eight feet long, and the Menoptra claim, perhaps a little callously, that they are "little more than cattle".
They possess little intelligence but were not at all aggressive until the Animus arrived. They were enslaved to the alien consciousness and considered the butterfly-like Menoptra (with which they once lived peacefully) their mortal enemies. Only they could control the woodlouse-like venom grubs (also known as larvae guns).
They returned to their normal ways after the Animus was defeated by the First Doctor, Ian Chesterton, Barbara Wright and Vicki. It is presumed that the various species on Vortis are now living peacefully together.

Zolfa-Thuran

Main articles: Meglos

Zygon

Main articles: Zygon

:''See also: Terror of the Zygons''

External links

★ The Bumper Book of Doctor Who Monsters, Villains & Alien Species

★ The Doctor Who wiki

References

1. Gridlock commentary podcast
2. Revenge of the Judoon
3. "Return Of The Ood"
4. 1950s Torchwood memo (partial)
5.
Doctor Who - Fact File - "The Last of the Time Lords"

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