You must watch the new "House of the Dragon" if you've been a fan of the epic fantasy series "Game of Thrones" for the previous ten years.

On Sunday, August 21 at 9 p.m. Eastern, HBO Max will debut the prequel. Taking place 200 years before "Game of Thrones," the new series

narrates the tale of the dragons that belonged to House Targaryen. On upcoming Sundays, nine additional episodes will be released.

For almost 300 years, House Targaryen ruled over Westeros and the Seven Kingdoms.

Just before the premiere of "Game of Thrones," that changed. Newcomers should know that Westeros is a vast continent about the size of South America.

The conflict over who will rule the seven kingdoms of Westeros and inherit the Targaryen dynasty is one of the show's many subplots.

The focus of "House of the Dragon" is on a single family or house's ancestors.

HBOMax is urging viewers to watch seven free episodes if they want to catch up or need a refresher.

The George R. R. Martin books "A Song of Ice and Fire" served as the inspiration for both "Game of Thrones" and "House of the Dragon."