Fiona Walker

Fiona Walker (born 24 May 1944 ) appeared in two Doctor Who television stories: as Kala in The Keys of Marinus and Lady Peinforte in Silver Nemesis. She also portrayed an uncredited role of Nemesis in Silver Nemesis. (REF: The Making of Doctor Who: Silver Nemesis)

She was also considered for the role of Queen Katryca in The Mysterious Planet. (TCH 42)

She was married to noted television director Herbert Wise, who cast her as Agrippina in I, Claudius in 1976.