HBO confirms 'Game of Thrones' prequel has finally started production and shares the first photo of the cast at a table read

• The first "Game of Thrones" spinoff to get a full-season order is officially in production.
• A Twitter account for "House of the Dragon" posted photos of what looks like a table read.
• Season one of the prequel show is set to premiere in 2022.

HBO's first "Game of Thrones" prequel show is in production, and now an official Twitter account for the "House of the Dragon" series is releasing photos of the cast at work.

On Monday morning, the newly unveiled "House of the Dragon" Twitter page shared photos of stars Matt Smith, Olivia Cooke, Emma D'Arcy, Steve Toussaint, and more at what appeared to be a socially distanced table read.

In all of the photos, you can see the cast members' names on the backs of tablet devices, all of which presumably are displaying the season one scripts.

"House of the Dragon" will take place about 200 years before the events of "Game of Thrones," and based on the cast of characters, be centered around the bloody Targaryen civil war known as the Dance of the Dragons.

HBO has already announced that the new show will premiere sometime in 2022. Familiar faces are attached to the project, like coshowrunner Miguel Sapochnik (who directed memorable "Game of Thrones" episodes like "Battle of the Bastards") and composer Ramin Djawadi.

To learn more about the "House of the Dragon" prequel series, read our deep dive into all the confirmed details of the show here.