Doctor Who's video: Meet the Vashta Nerada Silence in the Library HD Doctor Who

As the Doctor and Donna try to make sense of their mysterious new ally, a terrifying threat makes its move in the Library. Subscribe to Doctor Who for more exclusive videos: http://bit.ly/SubscribeToDoctorWho WATCH MORE: Series 4: http://bit.ly/DWSeries4​ The Tenth Doctor: http://bit.ly/DWTenthDoctor​ Donna Noble: http://bit.ly/DW-DonnaNoble MORE ABOUT DOCTOR WHO: Welcome to the Doctor Who Channel! Travel in the TARDIS with clips dating back to the Doctor's first incarnation in 1963, all the way through dozens of regenerations. Including behind-the-scenes footage, exclusive videos and our very own show Doctor Who: The Fan Show - this is the place to find all the best official clips. Want to share your views with the team behind Doctor Who and win prizes? Join our audience panel here: https://www.bbcstudiosvoice.com/register This is a commercial channel from BBC Studios. Service information and feedback: https://www.bbcstudios.com/contact/contact-us/