HBO has released the official first images from Game of Thrones spinoff House of the Dragon. The images feature series stars Emma D’Arcy, Matt Smith, Olivia Cooke, Rhys Ifans and Steve Toussaint.

The upcoming series, which began production last month is set 300 years before the original Thrones series. It will tell the story of the Targaryen family, ancestors of Mother of Dragons Daenerys Targaryen (played by Emilia Clarke), as House Targaryen begins its historic downfall.

The cast so far includes Matt Smith as Prince Daemon Targaryen, Paddy Considine as King Viserys, Olivia Cooke as Alicent Hightower, Emma D’Arcy as Princess Rhaenyra Targaryen, Sonoya Mizuno as Prince Daemons’ unlikely ally Mysaria, Rhys Ifans as Hand of the King Otto Hightower, Steve Touissant as Lord Corlys Velaryon aka a legendary Westerosi seafarer known as The Sea Snake, Fabien Frankel as the knight Ser Criston Cole and Eve Best as Lord Corlys’ wife Princess Rhaenys Velaryon.

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Earlier, in an interview, HBO/HBO Max chief content officer Casey Bloys had said that showrunners Miguel Sapochnik and Ryan J. Condal are “prepping” and “have been writing for a long time”. He added that they have drafts of all 10 Season 1 episodes “in various stages.”

The series is one of several spinoff Game of Thrones projects in the works, including a Broadway show and the Dunk and Egg novellas and planned TV adaptation. A prequel starring Naomi Watts has already been killed by HBO.

House of the Dragon is based on author George R R Martin’s 2018 novel Fire & Blood. The series will premiere on HBO and HBO Max in 2022.