Dame Diana Rigg and her daughter Rachel Stirling are to appear in 'Doctor Who'.
The pair will play a mother and daughter who are hiding a dark secret in the episode written by Mark Gatiss - which will begin filming today (02.07.12) - and Diana, best known for her role in Bond movie 'On Her Majesty's Secret Service', admits she is delighted to be taking part.
She said: "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?"
Rachel added she was pleased because the script for the episode was "funny" and "original", unlike other offers the pair have had before.
She added: "What joy. I am looking forward to the madness of 'Doctor Who' enormously. Mark Gatiss has written a gift of a script and an on-screen relationship between Ma and I that is truly delicious.
"We have never before worked together because the offers have not been tempting, but when such a funny and original script comes through you know the time has come."
The pair will star alongside Matt Smith as The Doctor and his new companion Jenna Louise-Coleman in the episode, which will air in 2013.