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Vashta Nerada
Home Planet: Unknown
Life Form: Carnivorous swarm
Info: Vashta Nerada (literally: the shadows that melt the flesh) are microscopic swarm creatures which, when present in a high enough concentration, are totally indistinguishable from shadows.

Despite being microscopic as individuals, Vashta Nerada swarms are sentient, developing the ability to communicate if there is some sort of communications devise nearby. The last heard of the Vashta Nerada, they are inhabiting The Library, where the remains of their home forest now exists as books.
Episode appeared: Silence in the Library, Forest of the Dead


Vespiform
Home Planet: Unknown, Silfrax Galaxy
Life Form: Morphing insectoids
Info: The Vespiform are a species resembling giant wasps, born in hives in the Silfrax Galaxy. Each possesses the ability to morph into other species and can breed with other species - including humans - to produce offspring.

Vespiform have a telepathic connection to objects called firestones, which contain part of their mind and, like Earth's wasps, they are vulnerable to water.
Episode appeared: The Unicorn and the Wasp


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Weeping Angels
Home Planet: Unknown
Life Form: Stone humanoid
Info: The Weeping Angels evolved near the beginning of the universe and are described as "creatures of the abstract" and "the lonely assassins". One touch from an Angel 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.


They also had a unique and nearly-perfect defence mechanism, quantum-locking, which caused them to turn into stone when being observed. When not being observed, they move incredibly fast to catch their victims. While in their locked state they appear as stone statues, often covering their eyes so that they will not see themselves, and lock themselves forever.
Episodes appeared: Blink


Werewolf
Home Planet: Unknown
Life Form: Lupine wavelength haemovarioform
Info: Werewolfs have appeared several times throughout the Doctor's adventures. However, the most recent encounter explained how the werewolf was an alien entity that fell to Earth in 1540. Upon impact, only a single cell survived.


The wolf cell was cultivated in young boys kidnapped by the monks of the monastery, the Brethren, who turned away from worshipping God and began to worship the wolf instead. The werewolf showed an aversion to mistletoe, although whether this was a physical allergy or a conditioned reflex was not established. The werewolf was eventually dispelled through a dose of pure moonlight, although a single cell may have survived by infecting Queen Victoria.
Episode appeared: Tooth and Claw


The Wire
Home Planet: Unknown (possible Hermethica)
Life Form: Plasmic energy (possibly Hermethican)
Info: The Wire was originally the leader of a gang of criminals who could convert themselves into plasmic energy, and use this ability to take over cities on their homeworld. Eventually their reign of terror came to an end, and the Wire was executed, however it managed to preserve itself as an energy being that eventually escaped to Earth in 1953.


On Earth, it concealed itself in television signals, hiding under the disguise of a television presenter. Here is would transfer itself from set to set and feed on the electrical activity of the brains of those watching it. Its victims would be drained of neural energy, and their faces completely erased, making them mindless.

However, the Doctor was able to trap the Wire on a Betamax tape using a makeshift video recorder. The Wire's victims were restored to normality.
Episodes appeared: Idiots Lantern