The film writer and children’s novelist’s involvement in the series was confirmed by the BBC on Friday.
His episode will feature a cast of child actors including Harley Bird, the voice of household favourite Peppa Pig, alongside Abigail Eames (Harry And Paul, The Crimson Field), Ashley Foster (The Woman In Black) and Jaydon Harris-Wallace (CITV Text Santa).
The new series starts on August 23rd and marks new star Peter Capaldi’s first full-length appearance as the Doctor.
Show bosses have secured an impressive line-up of guest stars to appear opposite Capaldi, including Michelle Gomez, Frank Skinner, Ben Miller, Tom Riley, Keeley Hawes and Hermione Norris.
Cottrell Boyce says: “Of all the thrills that pen and paper have brought into my life, there’s nothing that quite compares to the buzz of unlimited possibility that rushes through your fingers and into your brain when you write the words: ‘Interior … TARDIS’.”
“I was flabbergasted to be asked to write an episode – partly because I’ve been so absorbed in the last few series that I’d sort of forgotten that it wasn’t real.”
Steven Moffat, lead writer and Executive Producer, says: “
Frank’s script is pure magic – and everything I could have hoped for from the genius behind the Olympics opening ceremony!! Doctor Who is born anew in the mind of a genius!”