An actress best known for her work on the big screen — including two Academy Award nominations — will star in HBO’s “Game of Thrones” prequel. Deadline reports that Naomi Watts will lead an ensemble cast in the prequel pilot.

The untitled project comes from writer Jane Goldman and author and “Thrones” co-executive producer George R.R. Martin.

Watts was nominated for an Oscar in 2004 for her leading role in “21 Grams” and received another nod for lead actress for “Lo imposible” in 2013.

“The creative team behind the project is not giving away much about Watts’ character — she will play a charismatic socialite hiding a dark secret,” Deadline notes.

The prequel is created by Goldman and Martin and written by Goldman based on a story by her and Martin, Deadline reports, adding that the prequel “takes place thousands of years before the events of ‘Game of Thrones.’ It chronicles the world’s descent from the golden Age of Heroes into its darkest hour. And only one thing is for sure: From the horrifying secrets of Westeros’ history to the true origin of the white walkers, the mysteries of the East to the Starks of legend… it’s not the story we think we know.”