Trivia / Doctor Who S35 E3 "Under the Lake"

• Disabled Character, Disabled Actor: Cass is the first character to be played by a deaf actress in the history of Doctor Who (hence the Signed Language).^note Not the first deaf performer in Doctor Who — the best known example is Tim Barlow as Tyssan in "Destiny of the Daleks", although the character was not deaf.
• Working Title: The "Readthrough Draft" of the script for this episode was titled "Ghost in the Machine".

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