Sarra Vanser

 wasn't sure of her name when asked by Erys. The Sixth Doctor rescued her from a collapsing space yacht. She had amnesia. She had a picture of her daughters sewn into her trousers. She could hear the voice of Elgin Vanser who told her not to trust the Doctor. Her amnesia was deliberate as it was the perfect defence from Erys. She came to find her children from Erys. (AUDIO: The Brood of Erys)