It's full steam ahead for the first of multiple Game of Thrones spinoffs that are set up at HBO.
The first one, which is untitled as of now, has finalized its series regular cast. We don't know a lot so far about the series, but we do know that it is a prequel set thousands of years before the events of Game of Thrones.
Tuesday, HBO announced the rest of the main cast who'll join series topliner, Naomi Watts, who will portray a "charismatic socialite hiding a dark secret." Unlike its parent series, this untitled spinoff (which has just a pilot order right now) will have a more diverse cast.
Three Black actors make up the main casst, including Naomi Ackie, who will also star in the upcoming Star Wars. Sheila Atim and Ivanno Jeremiah have also been cast as regulars.
Josh Whitehouse, Denise Gough, Jamie Campbell Bower, Alex Sharp, Georgie Henley and Toby Regbo round out the main cast.
Since we don't know much about the series as a whole, no other character descriptions are known right now either.
Here's the logline for the potential series: "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."
Atim won an Olivier Award for her role in Girl From the North Country and Jeremiah as appeared in Humans and Black Mirror.