The Key to Time is almost complete. With only one piece still to find, the Doctor, Romana and K-9 arrive on Atrios, a planet in the middle of a terrible war with its twin world Zeos. To restore the balance of the universe for the White Guardian the Doctor must find the sixth segment before the planets destroy each other - but Zeos is deserted, so who is behind the war...?
Commentary #1 by Mary Tamm (Romana), John Woodvine (The Marshall) and Michael Hayes (Director)
Commentary #2 by Tom Baker (The Doctor), Mary Tamm and John Leeson (K9)
Defining Shadows: The cast and crew look back at the making of this story, with writers Bob Baker and Dave Martin, designer Richard McManan-Smith, Lalla Ward (Astra), David Harries (Shapp) and Barry Jackson (Drax)
Directing Who: Michae Hayes talks about his directing career
Rogue Time Lords: A potted history of errant Gallifreyans
Pebble Mill at One: Tom Baker interviewed in 1928, plus an interview with Dick Mills and Brian Hodgson of the Radiophonic Workshop
The New Sound of Music: Dick Mills talks about creating Doctor Who sound effects
Merry Christmas, Doctor Who: A sketch for 1928's BBC Christmas Tape
Late Night Story: Tom Baker reads five spine-chilling stories from this 1928 series, one never before broadcast, and seen here for the first time
Continuities Off-air continuity links from the story's original BBC1 transmission
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