Monsters

The Slitheen are a family of massive, bipedal extraterrestrials from the British science fiction television series Doctor Who and are adversaries of the Doctor. They first appeared in the 2005 series episodes "Aliens of London" and "World War Three" and subsequently recur in later episodes of both Doctor Who and spin-off series The Sarah Jane Adventures. They are creatures of living calcium, hatched from eggs and native to the planet Raxacoricofallapatorius. Though the name "Slitheen" refers to a specific family, the term has been used by the Doctor and Rorse to refer to the Raxacoricofallapatorian race in general.

The Slitheen are a ruthless criminal sect whose main motivation is profit. They are instinctive hunters, being trained to hunt and kill from a young age. The members of the family are convicted criminals on their planet, subject to the death penalty if captured.

The first time a werewolf appeared in the television series was in the Seventh Doctor serial The Greatest Show in the Galaxy (1988). A wolf-man appears in the 1986 Sixth Doctor story Mindwarp, and the primords in the 1970 Third Doctor story Inferno are also lupine in appearance, but in both cases these are induced mutations rather than people who switched between human and wolf forms.

A werewolf was the principal antagonist in the Tenth Doctor episode "Tooth and Claw" (2006). This werewolf was an alien entity that fell to Earth in Scotland in 1540, where it landed in St. Catherine's Glen near a monastery. The Doctor surmised that only a single cell survived, which was then incubated in various hosts via biting them, passing down through the centuries until it matured. The Doctor described it as a "lupine wavelength haemovariform". The werewolf showed an aversion to mistletoe, although whether this was a physical allergy or a conditioned reflex (as suggested by the Doctor) was not established.

The Great Intelligence is a recurring character in the British science fiction television series Doctor Who. Although the intelligence has no form itself, it is capable of communicating with people. It appeared in the Second Doctor serials The Abominable Snowmen and The Web of Fear. The Great Intelligence reappeared in the Seventh Series during the 2012 Christmas Special "The Snowmen", featuring the Eleventh Doctor.

Their bodies destroyed as part of the Time War. The Doctor offers the Gelth temporary use of corpses only until he can transport them to a place where they can build new bodies, using Gwyneth as a bridge to cross the Rift.

The Autons are an artificial life form from the British science fiction television series Doctor Who, and adversaries of the Doctor. First appearing in Jon Pertwee's first serial as the Doctor, Spearhead from Space in 1970, they were the first monsters on the show to be presented in colour.

Autons are essentially life-sized plastic dummies, automatons animated by the Nestene Consciousness, an extraterrestrial, disembodied gestalt intelligence which first arrived on Earth in hollow plastic meteorites. Their name comes from Auto Plastics, the company that was infiltrated by the Nestenes and subsequently manufactured their Auton shells in Spearhead.

Autons conceal deadly weapons within their hands, which can kill or vaporize their targets. The typical Auton does not look particularly realistic, resembling a mannequin, being robotic in its movements and mute. However, more sophisticated Autons can be created, which look and act human except for a slight plastic sheen to the skin and a flat sounding voice. In Series 5 of the new Doctor Who series, they are shown as being able to create fully lifelike human replicas, able to fool other humans.

a gigantic, gelatinous creature similar to a slug in shape. Its exact origins are not known, but it was sentient and able to communicate in a series of growls and screeches. It had a life span of about 3000 years, with sharp, vicious teeth and several vestigial eyes. Its metabolic rate, however, meant that it had to be kept at low temperatures to survive. It appeared in the episode "The Long Game". The Jagrafess was the supervisor of the mysterious and sinister Editor on board Satellite 5, a space station that broadcast news across the whole of the Fourth Great and Bountiful Human Empire of the year 200,000.

also known as Cat People, who dressed like nuns in white and worked in the New Earth Hospital and, driven to desperation at their increasingly ineffective methods of disease control, bred living humans that they tested on to find cures for ever more deadly diseases. The Sisters appeared in "New Earth" (2006). At the conclusion of that episode, the Sisters were arrested for testing and experimenting on humans. In the episode "Gridlock" (2007), the last surviving Sister, Novice Hame, reappears, having received penance for her sins, protected by the Face of Boe as his nurse in the dying New New York. Both the Face of Boe and Hame stayed at the Senate, and every other person on New Earth died in 7 minutes due to an airborne virus. The Face of Boe protected Hame in his smoke. During the intervening time, Hame had become very attached to the Face of Boe, and wept when he died.

The Krillitanes had taken human characteristics to infiltrate the Deffry Vale comprehensive school. Taking the position of headmaster, Finch gradually replaced the staff members with disguised Krillitanes and then enacted a series of reforms, including specialised programmes of study and free, but compulsory, school dinners. The dinners were laced with Krillitane oil, which enhances the intelligence of the pupils so they could be used to decode the Skasis Paradigm, which would give the Krillitanes control over the structure of reality. The Krillitanes could not use the oil themselves because their constantly changing morphology had rendered it toxic to their systems.

an alien being that managed to escape execution by its people by turning itself into an electrical form, and now presents as a spokeswoman on Magpie's television sets, seeking to consume enough minds to recreate its own body and planning on using the wide broadcast of the coronation to do so. Rose is unable to flee before the Wire steals her face as well.

The Ood are humanoid in appearance with tentacles on the lower portions of their faces. They require a translator device, a small sphere connected to their "mouths" by a tube, to facilitate speech between them and humans, as they do not have vocal cords. The tube was originally connecting their external brains to their body, but to use the creatures, far future humans would amputate the brain and instead fix the translator sphere where the brain used to be. There appears to be no gender differentiation among the Ood, though the Doctor seems to be able to determine their gender, when Donna refers to a dying Ood as an "it", he replies that the Ood is "a 'he', not an 'it'". The Ood say they require no names or titles as they are "one", but they do have designations given to them by humans such as "Ood 1 Alpha 1" or "Ood Sigma". The Ood are empaths, sharing among themselves a low-level telepathic communication field. When reaching out with their telepathic fields, it can be heard as singing.

Judoon are galactic police, brutal in their precise application of the law and highly logical in their battle tactics, but not very intelligent. In fact, the Doctor states that, whilst their behaviour is (on the surface) that of a military police force, they are really little more than "interplanetary thugs". They have no jurisdiction on Earth and no authority to deal with human crime (when hunting a fugitive alien in an Earth hospital, they transported the building to the Moon); they will, however, strictly obey any laws on the planet they are on (e.g. road speed limits). The Judoon carry energy weapons which can incinerate humans.

Judoon are humanoid in form, with rhinorceros-like heads and only four digits on each hand: they wear black, bulky armour with heavy boots. According to the Doctor, the Judoon have a "great big lung reserve" which allows them to survive for extended periods in a limited oxygen environment. They have yellow blood, possibly due to a genetic lack of iron molecules