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