Diana Rigg & Rachael Stirling Guest Star In ‘Doctor Who’ Season 7

The mother/daughter actress duo will take on the Doctor and his new companion during the upcoming seventh season.

Blair Marnellby Blair Marnell

For most of its existence, "Doctor Who" has attracted several of the top British performers to play off the title character. Thus it's surprising that Diana Rigg never made an appearance… until now.

BBC has officially announced that Rigg and her daughter, Rachael Stirling will appear together in the upcoming seventh season of "Doctor Who" as a mother and daughter harboring a dark secret. The episode in question will be written by Mark Gatiss, a "Doctor Who" veteran who is also the co-creator of the blockbuster "Sherlock" series alongside Steven Moffat.

The episode in question is being filmed this week in Cardiff under the direction of Saul Metzstein. Given the presence of Jenna-Louise Coleman's new companion character, this is likely part of the second half of "Doctor Who" season seven; which will debut in 2013.

Rigg is perhaps best known for playing Emma Peel in the '60s "Avengers" TV series, which is unrelated to the recently released film based on Marvel's Avengers. Rigg also played James Bond's wife, Tracy in the film On Her Majesty’s Secret Service. Stirling is also an actress with turns in "Tipping the Velvet," "Boy Meets Girl" and Snow White & the Huntsman.

“The first time Rachie and I will be working together is on an episode of “Doctor Who” specially written for us by Mark Gatiss," said Rigg in a statement. "How lucky is that?”

"What joy," added Stirling. "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.”

Doctor Who TV has posted a set report from Rigg and Stirling's episode that may contain some spoilers. So stop reading now if you don't want to know what's coming.

Matt Smith's and his new companion played by Coleman were spotted in 19th century period costumes, as was Rigg; whose character may be called Mrs Gillyflower. More intriguingly, Catrin Stewart is apparently reprising her role as Jenny from "A Good Man Goes To War." And where Jenny is, can her lover, Madame Vastra (Neve McIntosh) be far behind?

The seventh season of "Doctor Who" will begin this fall on BBC and BBC America.