Details on her character are unsurprisingly sparse - we don't even know this woman's name yet - but we do know Watts will be playing a charismatic socialite hiding a dark secret.
The big-budgeted spinoff is created by Jane Goldman (Kick-Ass, Kingsman) and GOT author and prequel co-executive producer George R.R. Martin, written by Goldman based on a story by her and Martin.
"'Game of Thrones' fans are always looking for new ways to represent their love for the show and their favorite characters", said Jeff Peters, vice president of licensing and retail at HBO. Most recently, she headlined the now-cancelled Netflix series Gypsy and appeared as Dougie Jones' wife (the oddly-named "Janey-E Jones") in Showtime's Twin Peaks: The Return, where she held her own against Kyle MacLachlan's most freakish character of the multiple he played on that revival show.
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Little is known about the planned spin-off, other than it'll take place thousands of years before events in Game Of Thrones in the Age Of Heroes. Make no mistake that when the new series arrives, only one thing is certain: 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.
Bloys agreed the prequel will feel "very different" since it represents a different time in Westeros, though he added it will still have a classic "Game of Thrones" feel. Chris Symes (The Alienist) will serve as a co-executive producer.
Game of Thrones is set to return for its six-episode conclusion in 2019. "The readers among you might want to grab a copy of Fire & Blood when it is released on November 20, though".