Anne Travers
Anne Travers was the daughter of Professor Edward Travers, and the scientific advisor to the British Army's fight against the Great Intelligence and its robot Yeti in the London Underground. She and her father helped the Doctor defeat the evil entity. (DW: The Web of Fear)
Four years later, Anne and her father visited the United States, leaving his home in the care of Isobel Watkins. (DW: The Invasion)
On 31st December 1999, Anne Travers, believing that Ashley Chapel was planning to summon the Great Intelligence, attempted to stop him, accidentally causing London to transform into a mystical realm, in which she was the Hierophant Anastasia. She later sacrificed herself to restore London to normal. (MA: Millennial Rites)