The Game of Thrones prequel has its first cast member!

According to Deadline, Naomi Watts has signed on to lead the cast of the prequel pilot which is in the works at HBO from writer Jane Goldman and Game of Thrones author George R.R. Martin.

Little is known about who Watts will be playing aside from a "charismatic socialite hiding a dark secret."

Goldman is attached to the project as showrunner, and will executive produce alongside Martin. Simply put, the spinoff is in good hands.

Plot details were revealed earlier this year ahead of the pilot order.

According to the official logline, “the series 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.”

Sounds intriguing, right?

“None of the characters or actors from Game of Thrones will appear in the new show," Martin said of the prequel in a blog post in June, adding:

"All of the successor shows we’ve been developing have been prequels, as I have mentioned before."

"This one really puts the pre in prequel, since it is set not ninety years before Game of Thrones (like Dunk & Egg), or a few hundred years, but rather ten thousand years (well, assuming the oral histories of the First Men are accurate, but there are maesters at the Citadel who insist it has only been half that long)," he continued.

"We’re very early in the process, of course, with the pilot order just in.”