Diana Rigg cast opposite her daughter in Doctor Who Avengers actress Dame Diana Rigg will perform alongside her daughter Rachael Stirling in a new episode of Doctor Who, it has been announced today. It will be the first time the two have been seen together on screen. Mark Gatiss has written the episode where Rigg will play a Yorkshire local and Stirling will play her daughter. Details on the characters are few, but the BBC have said they will be a duo with a 'dark secret'. Rigg said of the announcement: "the first time Rachie and I will be working together is on an episode of Doctor Who specially written for us by Mark Gatiss. How lucky is that? Her daughter said she had not worked with her mother before because the offers had 'not been tempting'. She added: "but when such a funny and original script comes through you know the time has come." Diana Rigg became famous in the Sixties for roles on screen such as Emma Peel in The Avengers and in the Bond film On Her Majesty's Secret Service. Her daughter Rachael Stirling has performed in theatre, film and television and was nominated for an Olivier Award for her role in An Ideal Husband on the West End in 2010. She recently starred opposite Mark Gatiss in the Donmar Warehouse's production of The Recruiting Officer. The episode will air on BBC One in 2012 and will be directed by Saul Metzstein. Filming begins this week in Cardiff.