Vashta Nerada

Place of Origin: n/a
Life Form: Microscopic, swarming carnivores

Vashta Nerada were small, carnivorous beings. Their name meant “shadows that melt the flesh”, and that’s what they could do. The Vashta Nerada were microscopic beings that lived in swarms, thousands strong. Swarms of them lived on almost every planet, which had organisms with meat. While these swarms were not common, they inspired a fear of the dark in most species across the Universe. Vashta Nerada swarms hunted in forests because they hatched from their spores there. These swarms were able to strip a creature to its bare bones in milliseconds. The Doctor described them as "piranhas of the air". The swarms lived in the darkness, and cast shadows when they entered the light - even to the extent of stopping the reach of light from fission lamps. Vashta Nerada were capable of latching their shadows onto a victim's shadow and changing to appearance of their shadow to that of their victim's. This would cause the victim to have two shadows. If the swarms were discovered, they could enter at least through a thick spacesuit and devour the body. They could then use the suit as a vessel to attack more prey. Vashta Nerada had existed since the early Universe, and spread to many planets across the Universe. They were rare, and on some planets such as Earth they survived by scavenging meat from dead animals often those that had been killed on the many roads. In the 50th century, however, one planet suffered a large infestation. The Library was attacked by quadrillions (it would be difficult to estimate just how many there were as the computer capped at 1 trillion) of Vashta Nerada due to the spores inside the books' paper hatching. There were no survivors, and the planet was empty for 100 years until an archaeological expedition and the Doctor with Donna Noble landed on the planet. In this time, the Doctor was given advice on how to deal with the Vashta Nerada. This was; "Count the shadows." The Doctor later gives the Archaeological team a caution to "Stay out of the shadows."

Episodes: Silence in the Library, Forest of the Dead