【】The prequel series to HBO's

The prequel series to HBO's。 Game of Thrones 。has its first star: Naomi Watts.。

Watts has signed on as "a charismatic socialite hiding a dark secret," though all other details, including her character's name, remain a mystery. The casting brings to an end to what Deadline describes as the "lengthy negotiations" that led to the show's first cast member signing on.。

SEE ALSO:6 people who might show up in the 'Game of Thrones' Age of Heroes prequel 。

As we previously learned, the prequel series is set thousands of years before the events of
。 As we previously learned, the prequel series is set thousands of years before the events of。Game of Thrones。

. It unfolds during the late stages of Westeros's so-called "Age of Heroes," a time that featured -- among other things -- humanity's first clash with the White Walkers. 。Mashable Top StoriesStay connected with the hottest stories of the day and the latest entertainment news.Sign up for Mashable's Top Stories newsletter
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By signing up you agree to our Terms of Use and Privacy Policy.  。 Thanks for signing up!。Watts is the first and only cast member to be revealed so far.。

Game of Thrones。

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creator George R.R. Martin is involved as an executive producer, alongside Jane Goldman, also the prequel's showrunner.。

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It's not clear when the series pilot will be shot or when anyone outside of HBO will get to see it. But given the topsy-turvy nature of Hollywood creative development, where projects can disappear in an eyeblink, this casting news is a good sign that HBO is moving forward with the prequel.。

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Featured Video For You 。The folks behind this 'Game of Thrones' tapestry stan harder than you。TopicsGame Of ThronesHBO。

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