House of the Dragon: The Game of Thrones Prequel Is Stacked With a Full Cast

D'Arcy is set to star as Princess Rhaenyra Targaryen, who is the king's first-born, pure Valyrian-blooded child and a dragonrider. According to Variety, Rhaenyra was "born with everything . . . but she was not born a man."

The Doctor Who and The Crown star will transform into Prince Daemon Targaryen — King Viserys' younger brother and heir to the throne. Daemon is described as a "peerless warrior and a dragonrider" who possesses the true blood of the dragon.

Cooke's character is the daughter of Hand of the King Otto Hightower. She was raised in the Red Keep where the king and his inner circle often machinate. Alicent is known as "the most comely woman in the Seven Kingdoms" and has "courtly grace and a keen political acumen."

Toussaint's role as Lord Corlys Velaryon stems from a Valyrian bloodline that's as "old as House Targaryen," according to Deadline. His character, also referred to as "The Sea Snake," is considered the most famous marine adventurer in the history of Westeros. He also "built his house into a powerful seat that is even richer than the Lannisters and that claims the largest navy in the world."

Mizuno is set to portray Mysaria, whose character came to Westeros with next to nothing and has "been sold more times than she can recall." Instead of folding under pressure, she rises up to become the most trustworthy ally to Prince Daemon Targaryen.

Frankel is taking on the part of Ser Criston Cole, who comes from Dornish descent and is the son of the steward to the Lord of Blackhaven. Without any claim to land or titles, all Cole has are his honour and swordsman skills.

Best is set to play Princess Rhaenys Velaryon, a dragonrider and wife of Lord Corlys Velaryon. She was passed over as the next heir to the throne because the realm preferred her male cousin, Viserys, simply because of his gender.

Corr is cast as Ser Harwin "Breakbones" Strong, aka possibly the strongest man in the Seven Kingdoms. He's the eldest son of Master of Laws Lyonel Strong and heir to Harrenhal.

Outlander star McTavish has been tapped to play Ser Harrold Westerling. Ser Harrold has served in the Kingsguard ever since the days of King Jaehaerys and embraces everything about chivalry and honour.

Ifans will be helming the role of Otto Hightower, also known as The Hand of the King, who faithfully and loyally serves his king and his realm.

Paterson will be playing the part of Lord Lyman Beesbury, known as Lord of Honeyholt and Master of Coin on King Viserys's small council.

Spokes joins the cast as Lord Lyonel Strong, the Master of Laws to King Viserys and Lord of Harrenhal.

Horovitch's role as Grand Maester Mellos serves as the voice of reason and also the trusted advisor to King Viserys.