Amid all the buzz for next year’s ‘Game Of Throne’ finale, it’s easy to forget that a spin-off series, in the form of a prequel, is well and truly in the works.

It was always going to happen; GoT has been so hugely successful that those folks over at HBO – good folks, I’ll admit – were never going to let that cash cow die quietly.

Not that I’m complaining; more GoT related stuff on my tele screen is never a bad thing.

Until now, though, HBO have remained tight-lipped about the Game Of Thrones prequel series, only spilling that it will take place “thousands of years” before the events in Game Of Thrones.

It has also been described as documenting “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.”

I’m hooked.

But thankfully we now have a title – thanks to none other than George R.R Martin himself.

The man behind the books has confirmed that the prequel series will be called ‘The Long Night’, while also revealing a very special cast member.

Posting on Twitter, he wrote: “Casting is now underway for THE LONG NIGHT, the first of the GAME OF THRONES successor series to ordered to film. HBO has just announced the first cast member: NAOMI WATTS is coming on board as one of our stars.”

Watts, who was nominated for an Oscar for her roles in The Impossible and 21 Grams, is the first cast member to be comfirmed for the new project.

According to Entertainment Weekly, Watts will play “a charismatic socialite hiding a dark secret” in the prequel, which is being written by X-Men: First Class‘s Jane Goldman and overseen by Martin.

Little else is known about the spin-off, but in the books ‘The Long Night’ refers to a lengthy period of darkness, which spread famine and terror across the Known World.

Production is expected to start sometime in February 2019 and will hit screens after the eighth and final season of Game of Thrones.

What a great time to be a GoT fan, ey.

Images via HBO/Getty