A look at the subtle (and not so subtle!) links to the show's past and future contained within the story of The Five Doctors.
A missing 1950s era airplane is found 27 years later at the bottom of a lake. British and Soviet spy agencies are intensely interested.
The true story of Greville Wynne, the British businessman who doubled as a spy on his trips to Russia, and Colonel Penkovsky, the high-ranking Soviet Intelligence officer who passed key information to the West.
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