British actress Olivia Williams has said that in more than 30 years of acting on screen, starring in Dune: Prophecy is the first time she has felt confident her scenes would not be cut from a project.

Williams, who has appeared in films including The Sixth Sense, Rushmore and An Education, and portrayed Camilla Parker Bowles, before she became Queen, in the final two seasons of The Crown, can now be seen in the TV prequel to the blockbuster Denis Villeneuve films.

She stars alongside her close friend Emily Watson, with the pair playing the Harkonnen sisters – two women fighting forces that threaten the future of humankind.

Based on the Dune and Sisterhood of Dune novels, the Sky Atlantic show is set 10,000 years before the birth of Timothee Chalamet‘s character, Paul Atreides, in the films, and follows the two women as they found the fabled sisterhood that will later become known as the Bene Gesserit.

Despite knowing each other for 30 years, and even working at the Royal Shakespeare Company (RSC) at the same time, the show marks Williams and Watson’s first time on screen together.

Williams says they are often asked why they have never acted together before. There’s a simple answer, she tells Sky News. “It’s because there are no scripts for two women of the same age to lead a story.

“We’re used to playing the character that can, if the film’s running a bit long, be cut out because you don’t genuinely affect the plot of the show. Well, just try cutting the Harkonnen sisters out of this story!”

She adds: “We knew that our work would be used – which, in 35 years, I’d say is the first time that’s happened.”

In Dune: Prophecy, Watson plays the Mother Superior of the Bene Gesserit Sisters, Valya Harkonnen, whilst Williams plays her younger sibling, Sister Tula Harkonnen.

Watson, who recently starred alongside Oscar winner Cillian Murphy in Small Things Like These, says it feels wonderful to be given the freedom to portray strong, stoic characters.

“When we were first cast, we went and sat in the National Portrait Gallery and sat in front of portraits of Queen Elizabeth I, Mary, Queen of Scots, Bloody Mary, and just thought about that time when those very powerful women were front and centre, and terrified and deeply paranoid because everybody wanted to either marry them or kill them.”

The two actresses first met outside the Black Swan pub in Stratford-upon-Avon when they were starting out in their careers with the nearby RSC.

Williams says it “doesn’t feel real” that their careers have become as successful as they have.

“It is an extraordinary thing that I said I would stop at 30 and go and try to be a lawyer. I didn’t intend to be working as an actor and now I can’t believe my luck.

“You get to the end of every job and you go, was that the last time I will act? And that is a really tough way to, you know, bring up a family and you can’t get a bloody mortgage or life insurance with a lifestyle like that. So anyway, that was my real-life whinge.”

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Watson said the experience of leading a big-budget series together was not lost on her, and she felt an onus to help create a positive environment for the younger actors.

“We were like the CEOs and we were making sure that everybody was seen and felt part of something and were feeling okay about how everything was going down. And it felt like a really healthy way to do it.”

Dune: Prophecy is available to watch on Sky Atlantic and Now