A double helping from the 'Doctor Who' archives. Never aired on television due to a strike in 1979, the uncompleted six-part adventure 'Shada' traces the chase to recover a powerful book, 'The Artifacts of Gallifrey', stolen from retired timelord Professor Chronotis (Denis Carey). Skagra (Christopher Neame) is the evil despot responsible for this foul jiggery-pokery. Original footage from this episode was used as the Fourth Doctor's involvement in 'The Five Doctors', before it was reassembled, with an older and portlier Tom Baker narrating the missing gaps. Also included is the BBC-produced documentary 'More Than Thirty Years in the Tardis', a compilation of clips spanning the first thirty years of the Doctor, including some previously unseen footage, plus interviews with the many stars, writers, producers and designers.