Hold the door! In June 2018, HBO gave the green light to a Game of Thrones prequel pilot from George R.R. Martin — the author behindA Song of Ice and Fire, the series of books upon which the original show is based — and screenwriter Jane Goldman (Kingsman: The Secret Service).

We now have an idea about when the series will begin production and how long we have to wait until it premieres, as well as some of the new faces that will play roles in it.

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Set thousands of years before the events ofGame of Thronesconclude — which may beeven crazier than you expect— the series will feature two-time Oscar nominee Naomi Watts in a lead role. The pilot for the still-untitled series has been filmed, but isn’t expected to premiere until 2020 or, more likely, 2021.

Here’s everything we know about theGame of Thronesprequel series so far.

The pilot — and beyond

As promised, production on theGame of Thronesprequel started in summer 2019, and while the show is set too early in Westeros’ history to feature any of your favorite characters, you might recognize some locations.Entertainment Weeklyreported that filming on the prequel began in Northern Ireland, which was home to Winterfell and parts of Dorne, Riverrun, and the Iron Islands during production of the original series.

By the time theTelevision Critics Association press tourrolled around a couple of months later,production on the pilot was finished, and Casey Bloys, HBO’s chief of programming, had some very nice things to say about it. “The cast looks really, really good,” Bloys told Deadline, and while there isn’t an edit of the episode yet, “It’s exciting.”

Bloys also indicated that the otherGame of Thronesprequels in development might be put on hold until this one airs. “I want to see how this one goes,” said Blo, who also confirmed that the show would air on HBO in addition toHBO Max, WarnerMedia’s upcoming streaming service. Bloys didn’t reveal a release date for the show, but seemed to think that a 2020 debut felt a little “rushed.”

Oh, by the way, about thatGame of Thronesseason 8 reshoot thatover a millions fansdemanded? Bloys said that it “shows a lot of enthusiasm and passion for the show” andleft it at that. In other words: It’s not happening.

More cast members wereadded to the seriesin March 2019, withDefinitely, Maybeactor Marquis Rodriguez,Doctor Whoactor John Simm, andNotting Hillactor Richard McCabe all joining the show, along with British stage actor John Heffernan and young actress Dixie Egerickx.

A flurry of new cast members was announced a few months earlier, joining previously announced lead actressNaomi WattsandPoldarkactorJosh Whitehouse. That batch of new additions includes Naomi Ackie(Star Wars: Episode IX),Denise Gough (Angels in America), Jamie Campbell Bower (Twilight), Sheila Atim (Harlots), Ivanno Jeremiah (Black Mirror), Georgie Henley (The Chronicles of Narnia), Alex Sharp (To the Bone), and Toby Regbo (Fantastic Beasts: The Crimes of Grindelwald).

The character Whitehouse will play in the series is a bit of a mystery; no details were revealed in the casting announcement made byThe Hollywood Reporter. All that’s known about his character is that he’ll play “a key role, though not the central male lead.”

Whitehouse is best known for his portrayal of Hugh Armitage in period dramaPoldarkand will appear next in a remake of 1983’sValley Girl.

Just a few days before Whitehouse joined the series’ cast, theGame of Thronesprequel added some serious star power with Watts, a two-time Oscar nominee, joining the show in a lead role.

According toVariety, Watts will play “a charismatic socialite hiding a dark secret” in the series. She was the first actor to be cast in one of the series’ lead roles, and her attachment to the project first indicated it was gaining some official momentum.

From production to premiere

A few months before the final season ofGame of Thronespremiered on HBO, Casey Bloys, the network’s programming president, toldEntertainment Weeklythat the series won’t premiere until at least a year afterGame of Thronesconcludes its run. That will likely put the show on TV at some point in 2020 or 2021, although filming began much sooner.

World-building

In an interview withThe New York Times, Martin indicated that Goldman will have a lot of open space to create the world of the series, as the particular age in which it’s set — thousands of years before the events of Martin’s novels — isn’t referenced all that much inA Song of Ice and Fireor the HBO series.

“If you look at the published books so far, there’s really very little material about that — a sentence here, a sentence there. Old Nan tells a tale that takes up a paragraph. So Jane had to create the characters, the settings, and some of the events,” explained Martin. “We had to look at everything that was said and say, ‘OK, here’s what was said at this point, we need to make it consistent to that.’ We kicked around some ideas and I made some suggestions. But mostly it’s been Jane running with it.

“It’s set thousands of years beforeGame of Thrones,” he added. “King’s Landing does not exist. The Iron Throne does not exist. There are no dragons there.”

Behind the camera

HBO has reportedly hiredThe DefendersandJessicaJones director S.J. Clarkson to helm the pilot episode of the still-untitledGames of Thronesprequel series, according toThe Wrap. Clarkson was previously attached to direct the next installment of the Star Trek movie franchise, but that project has seemingly stalled in development limbo.

Last year, HBO confirmed the scheduled start of production on the pilot during the Television Critics Association (TCA) summer press event. The network has Goldman attached as showrunner and executive producer alongside Martin and several otherGame of Thronesexecutive producers.

.@HBOboss Casey Bloys on@GameOfThronesprequel pilot: Starting search for director, hoping to start shooting next year.#GameofThrones#TCA18

— Debra Birnbaum (@debrabirnbaum)June 13, 2025

Rumors surrounding multiple prequel projectshave been flying for a while. It is a bit surprising, though, that Martin would offer his assistance on this particular project, considering he was less than pleased whenThronesdeviated heavily from the books (the sixth volume,TheWinds of Winter, has been delayed several times thus far).

Apparently, Goldman “won” a sort of contest at HBO in which five writers came up with ideas for prequels and spinoffs; the other four are “still under consideration” at HBO. Her previous writing credits includeKick-Ass,X-Men: First Class,andX-Men: Days of Future Pastand she will be writing the script for Disney’s upcoming live-actionLittle Mermaidreboot.

The series will be set thousands of years before the events ofA Song of Ice and Fireand reportedly involves the final days of the Age of Heroes, a time when many great kings and heroes (Bran the Builder, Lann the Clever, the Grey King) lived. Due to the era in which the show is set, HBO and Goldman have indicated thatGame of Thronesfans shouldn’t expect to see any of their favorite characters in the prequel series.

The show issaid to chronicle“the world’s descent from the 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, it’s not the story we think we know.”

Game of Throneswill conclude its eight-season run this year, after which showrunners David Benioff and D.B. Weiss will go on to develop a trilogy of Star Wars films for Disney. The two reportedly “elected not to be involved” with Goldman’s prequel project.

Updated on June 29, 2025: Added information about the end of pilot production.