As Doctor Who celebrates 50 years, we go behind the lens on the year's most anticipated television drama. Voiced by the Sixth Doctor, Colin Baker, we catch up with old friends and meet some new ones. It's a rollercoaster ride and a time to celebrate. Features Matt Smith, David Tennant and Jenna Coleman with Billie Piper and John Hurt, as well as lead writer and executive producer Steven Moffat, discussing their 50th Anniversary experiences.