The official website revealed: "We’re delighted to reveal that Jemma Redgrave will be returning to Doctor Who for the show’s 50th anniversary special. She previously appeared in 2012’s 'The Power of Three' playing Kate Stewart, daughter of the legendary Brigadier Lethbridge-Stewart."
The website also promises more news about the episode "very soon".
Matt Smith and Jenna-Louise Coleman will appear alongside David Tennant, Billie Piper, Joanna Page and John Hurt in the special, which will air in November.
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