Last year, which was Doctor Who's 50th anniversary, Kate O'Mara said she would love to reprise her role as The Rani.
O'Mara told the Huffington Post: "I'd love to come back as The Rani another time around.
"To have a much older woman as your adversary, there's something interesting about that."
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Prince Harry is in Toronto, the host city of the Invictus Games, ahead of Saturday night's opening ceremony.
The Prime Minister said she expected an implementation period of "around two years" as she called for a "creative" approach to talks.
The first signs of autumn are appearing as the equinox marks the start of the season.