Bio: Weevils are Cardiff's "resident alien" in the Doctor Who universe. They populate the sewers of that city, having been drawn there by the Space/Time "Rift" that runs through the pedestrian mall at the heart of the city. Their population may number as much as a thousand by the 21st century, although a census has probably not been undertaken by Torchwood 3.
Weevils are generally docile. However, they can become enraged, and their teeth and great strength make them a danger to humans. They are generally regarded as extraterrestrial by Torchwood 3. However, years of study have so far failed to produce a planet of origin or even a proper species name. Another possibility is that they are actually native to Earth, but from a different time period.