John Lucarotti (20 May 1926-20 November 1994) wrote the screenplays for the Doctor Who stories Marco Polo, The Aztecs, and The Massacre of St Bartholomew's Eve. He later wrote the novelisations of all three stories: Marco Polo, The Aztecs, and The Massacre. Lucarotti also wrote the original script for the Doctor Who story The Ark in Space but was unable to do a rewrite because he was living on a boat in Corsica at the time. Robert Holmes did extensive rewrites and was credited with the story.