The cast and crew of 'The Poison Sky' discuss bringing back the Sontarans - and rehearsing their iconic war cry! Subscribe to Doctor Who for more exclusive videos: WATCH MORE: Compilations: Regenerations: Title Sequences: 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. #DoctorWho This is a commercial channel from BBC Studios. Service information and feedback:
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