Cardinal Ollistra was an important, high-ranking Time Lord during the Time War. She was played by Jacqueline Pearce of Blake's 7 fame, and was... actually pretty good. She shows up in some other audios set around the Time War too, and her previous incarnation has even appeared in the fourth boxset of Doom Coalition. The series needed more than 1 or 2 good characters, but at least she was one of them.