Ollistra (The Side of the Angels)

Cardinal Ollistra was a high ranking Time Lord. Through her life, she had some encounters with the Doctor, both in his seventh and eighth incarnations.

Capturing the Eleven
After the Eleven opened the Dark Universe, she conversed with Ace about what to do with the Eleven and decided to invade Gallifrey. She was one of the last Time Lords alive and was the most senior after Romana II and her high council were the first to be destroyed by the Eleven's plans. She helped to then trap the Eleven and gloated slightly when the universe was restored. (AUDIO: Dark Universe)

Opposing Padrac
With Gallifrey being taken over by Cardinal Padrac, Cardinal Ollistra sent Veklin and Volstrom to spy on him and learn of his plans whilst also recruiting his opposition on the High Council. Ollistra and the opposition councillors formed the Planning Council in New York City, starting to build an Enclave with the help of the Monk and the Weeping Angels to survive the end of the universe. (AUDIO: Songs of Love, The Side of the Angels)

Ollistra showed the city to the Eighth Doctor and was admonished by him for it, although she continued to believe that it was the right thing to do. When the Sonomancer caused a power cut for the benefit of the Angels, Ollistra and the Doctor returned to the planning office where the Eleven pushed her from the roof. Witnessed by Veklin, she regenerated into a new incarnation and said that "Gallifrey must stand". (AUDIO: The Side of the Angels)