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Fiona Lethbridge-Stewart (née Campbell) was the first wife of Alistair Gordon Lethbridge-Stewart, mother of Kate and grandmother of Gordon.

Fiona conceived Kate following the London Event. As early as the beginning of the Third Doctor's tenure as scientific advisor, the couple's marriage showed signs of strain; Kate was five years old at the time. (PROSE: The Scales of Injustice) The couple later divorced. (PROSE: The Face of the Enemy)

Behind the scenes

  • The name "Fiona" originated with Nicholas Courtney, who suggested this as the name of the Brigadier's wife, who would have been a non-speaking appearance in The Dæmons, though she did not appear in the televised story.