Werewolf

One type of werewolf was shown in Tooth and Claw. The werewolf (also known as a lupine wavelength haemovariform) was a large, hairy, wolf-headed humanoid. The infected human would turn into a werewolf whenever it was exposed to certain wavelengths given off by the moon (though too much moonlight to overload its system). It had increased strength and speed, and could shrug off bullets. The werewolf was vulnerable to mistletoe, though this might have been a conditioned response. It's unknown what affect silver would have, since none was used in the episode. It was also colourblind, but had a stronger sense of smell to compensate.

In the 1540s, a spacecraft holding a werewolf crashed into Scotland. Though only a few cells survived, they were found by the Brethren. The Brethren were able to find hosts for the werewolf, which then incubated in the host's blood and took over its mind. For 300 years it grew and developed. Eventually, it decided to take over Queen Victoria in order to create the Empire of the Wolf. Though it was stopped by the Doctor, it might have been able to infect Queen Victoria before it was destroyed.