Cybershades are minor villains in Doctor Who that help the Cybermen.
The Next Doctor
After the battle of Canary Wharf with the Cult of Skaro some of the Cybermen escape to Victoria London. To increase numbers they start to convert animals such as cats and dogs and made them Cybershades. Unlike the more restricted Cybermen they move more fluidly and are able to run and climb fast. Mercy Hartigan is put in charge of them and they are used for spying and guarding. One was chased by the Doctor and Jackson Lake but was able to escape. When Mercy and the Cyber King are destroyed so are all the Cybermen and Cybershades.