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 roles of Kassia in The Keeper of Traken (TCH 33), Tanha in Snakedance (TCH 36), Doctor Solow and Preston in Warriors of the Deep (TCH 38) and Queen Katryca in The Mysterious Planet. (TCH 42)

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