The Doctor and Clara are exploring the inside of a Dalek after being miniaturised, and the Doctor asks Rusty what it was that made him disavow the Dalek race.
The prop for the Rusty mutant was created using the same mould as the prop for the Dalek Caan mutant in Series 4. The same mould was used to create the Dalek Prime Minister mutant in Series 7.
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