Lethbridge - Stewart family The Lethbridge - Stewart family was a storied one . Notable members included Alistair Gordon Lethbridge - Stewart . History . Origins . Originally the Lethbridges were from Devon , and went on to be the Lethbridge Baronets of Devonshire , while in Lanark , Scotland , the Stewarts were part of the Clan Stewart ( PROSE : " The Forgotten Son " ) and related to the Stuart kings of Scotland . When James VI arrived to claim the English throne as James I in 1603 , the Brigadier ' s ancestor , William Lethbridge - Stewart , accompanied him . ( TV : " Terror of the Zygons " , PROSE : " The Dying Days " ) Ancestors of the Brigadier . Alistair came from a military tradition . ( COMIC : " The Warkeeper ' s Crown " ) Major General Fergus Lethbridge - Stewart was the Duke of Wellington ' s right - hand man at the Battle of Waterloo . ( PROSE : " The Scales of Injustice " ) The Brigadier ' s paternal grandfather Alistair Lethbridge - Stewart worked for British Intelligence in Russia during World War I . He returned to the United Kingdom in the aftermath of the Russian Revolution of 1917 . ( PROSE : " The Wages of Sin " ) His brother was named Archibald Hamish Lethbridge - Stewart . ( TV : " Twice Upon a Time " , PROSE : " Night of the Intelligence " ) He was a veteran of World War I who served at Ypres in December 1914 . Archibald was kidnapped by the Testimony moments before his death to record his memories and met the First Doctor and Twelfth Doctor due to a timeline error and shared an adventure with them . Before his memory was erased , he asked the Doctors to look in on his family which they promised to do . Unknown to all but the First Doctor , the Twelfth Doctor altered time slightly in order to save Archibald and his German opponent by moving them forward in time a couple of hours to the beginning of the Christmas Armistice . ( TV : " Twice Upon a Time " ) The Brigadier also had a " great uncle " Mario , really a second cousin of the Brig ' s Granny McDougal . ( AUDIO : " The Ghosts of N - Space " ) The Brigadier ' s father , Gordon Conall Lethbridge - Stewart , ended his life as a wing commander in the Royal Air Force in World War II , and was listed as missing in action in 1945 . ( PROSE : " The Forgotten Son " ) Descendants of the Brigadier . The Brigadier had many descendants who played significant roles in the history of Earth . Mariama and his descendants . As a young officer stationed in Sierra Leone , Lethbridge - Stewart fathered a son with Mariatu , daughter of Chief Yembe of the Royoke village . This son , Mariama , was the father of Kadiatu . Kadiatu authored " The Zen Military " , an exposé of the activities of UNIT published in 2006 . Kadiatu ' s great - grandson , Yembe Lethbridge - Stewart , led the UN forces during the Thousand Day War between human s and Ice Warrior s in the late 21st century and was the adoptive father of Kadiatu Lethbridge - Stewart , whose time travel activities at first proved quite troublesome for the Seventh Doctor . ( PROSE : " Transit " ) Kate Lethbridge - Stewart and her descendants . With his first wife , Fiona , the Brigadier fathered a daughter named Kate . Kate was estranged from her father for six years and it was not until the events surrounding the Great Intelligence ' s third attempt to conquer Earth in the 1990s that Lethbridge - Stewart learned Kate had given him a grandson , Gordon Lethbridge - Stewart . ( PROSE : " Downtime " ) Jonathan was the father of Gordon . But when Gordon was two years old Jonathan left the family . Neither Gordon nor Kate saw him again . ( HOMEVID : " Downtime " ) Kate later bore a second child . ( TV : " Death in Heaven " ) Around the 2010s , Kate was one of the leaders of at least the British division of UNIT . ( TV : " The Power of Three " ) Behind the scenes . In the unproduced Doctor Who 30th anniversary special " The Dark Dimension " Alistair Gordon Lethbridge - Stewart also had a son , Alexander Stewart , who died in 1979 at the age of ten .