The prequel series finds the Targaryen dynasty at the absolute apex of its power, with more than 15 dragons under their yoke. Most empires—real and imagined—crumble from such heights. In the case of the Targaryens, their slow fall begins almost 193 years before the events of Game of Thrones, when King Viserys Targaryen breaks with a century of tradition by naming his daughter Rhaenyra heir to the Iron Throne. But when Viserys later fathers a son, the court is shocked when Rhaenyra retains her status as his heir, and seeds of division sow friction across the realm.

In the near future a family must make difficult decisions as they balance staying together with trying to survive. They live in Los Angeles, which has been occupied by a force of outside intruders. While some people have chosen to collaborate with the authorities and benefit from the new order, others have rebelled — and suffer the consequences.