  city of death is the second serial of the seventeenth season of the british science fiction television series doctor who, which depicts the adventures of a time-travelling humanoid alien known as the doctor. it was produced by the bbc and first broadcast in four weekly parts between 29 september 1979 and 20 october 1979 on bbc1. the serial was written by "david agnew" â a pseudonym for david fisher, douglas adams, and graham williams â and directed by michael hayes. city of death features the fourth doctor (tom baker) and his companion romana (lalla ward). set mainly in paris in 1979, the plot concerns a scheme by an alien, scaroth, to steal the mona lisa to finance experiments in time travel in the hope of averting the accident that marooned him on earth four hundred million years previously, which began the existence of life on the planet as well. the serial's original storyline was devised by fisher but was heavily re-written by script editor adams, aided by producer williams. it was the first doctor who serial to film on location outside of the united kingdom; the production team worked in paris during april and may 1979. the studio work was completed in june. broadcast during a strike that took itv (the bbc's rival) off the air, city of death scored high ratings. the fourth episode was watched by over sixteen million viewers, the highest uk television audience ever attained 
1979_television_episodes Ancient_astronauts_in_fiction Depictions_of_Leonardo_da_Vinci_on_television Doctor_Who_stories_set_on_Earth Fourth_Doctor_serials Paris_in_fiction Screenplays_by_Douglas_Adams