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A follow-up to the previous Doctor Who adventure "The Pirate Planet," "The Stones of Blood" was the series' 100th story arc. The Doctor (Tom Baker) and Romana (Mary Tamm) continue their efforts to locate the missing segments of the Key to Time, which will restore the balance between good and evil. It turns out that the Key's third segment rests within the Nine Travellers, an ancient Druidic stone circle on the planet Earth. Locating the segment is the easy part -- the trick is to wrest the item from its pagan guardians. Written by David Fisher, episode one of the four-part "The Stones of Blood" originally aired on October 28, 1978.