The British director responsible for a number of well-known early stories in sci-fi series Doctor Who died Thursday. He was 82. Derek Martinus had suffered from Alzheimer’s disease, his family told the BBC. Active at the Doctor Who helm between 1965 and 1970 during the tenures of three different Doctors, his credits on the long-running BBC show include the Mission to the Unknown, The Tenth Planet, The Evil of the Daleks, and The Ice Warriors episodes, as well as the show’s first serial to be filmed in color, The Spearhead From Space. During his career the Yale-educated Martinus helmed episodes of A Little Princess, Z Cars, Blakes 7, Penmarric, and Spearhead and also directed the 1968 version of Henry James’ What Maisie Knew and the miniseries The Black Tulip.