 Additional Cast in alphabetical order: 
Milly Alcock as Young Princess Rhaenyra Targaryen. She’s the king’s first-born child, of pure Valyrian blood, and she is a dragonrider. Many would say that Rhaenyra was born with everything… but she was not born a man. 
Bethany Antonia as Baela Targaryen, eldest daughter of Laena Velaryon and rider of the young dragon Moondancer. 
Phoebe Campbell as Rhaena Targaryen, second daughter of Lady Laena and sister to Baela. 
Emily Carey as Young Alicent Hightower, the daughter of Otto Hightower, the Hand of the King, and the most comely woman in the Seven Kingdoms. Alicent was raised in the Red Keep, close to the king and his innermost circle; she possesses both a courtly grace and a keen political acumen. 
Harry Collett as Jacaerys Velaryon, eldest son of Rhaenyra Targaryen.  
Ryan Corr as Ser Harwin ‘Breakbones’ Strong. ’Breakbones’, Harwin is said to be the strongest man in the Seven Kingdoms.  Ser Harwin is the eldest son to Master of Laws Lyonel Strong and heir to Harrenhal.  
Tom Glynn-Carney as Aegon Targaryen, first-born son of King Viserys. 
Jefferson Hall as Ser Tyland Lannister, a crafty and calculating politician, twin to Lord Jason Lannister.  
Jefferson Hall as Lord Jason Lannister, the Lord of Casterly Rock and twin to Ser Tyland Lannister.  
David Horovitch as Grand Maester Mellos, a voice of reason and trusted advisor to King Viserys. 
Wil Johnson as Ser Vaemond Velaryon, younger brother to Coryls Velaryon and commander in the Velaryon navy. 
John Macmillan as Ser Laenor Velaryon, son of Corlys Velaryon and  Rhaenys Targaryen. 
Graham McTavish as Ser Harrold Westerling, who has served in the Kingsguard since the days of King Jaehaerys; he is a paragon of chivalry and honor.  
Ewan Mitchell as Aemond Targaryen, second-born son of Viserys, nephew to Daemon, and half-brother to Rhaenyra. 
Theo Nate as Ser Laenor Velaryon, son of Corlys Velaryon and Rhaenys Targaryen. 
Matthew Needham as Larys Strong, younger son of Master of Laws Lyonel Strong, brought to court by his father.  
Bill Paterson as Lord Lyman Beesbury, Lord of Honeyholt and Master of Coin on King Viserys’s small council.   
Phia Saban as Helaena Targaryen, second-born daughter of Viserys, sister to Aegon and Aemond, half-sister to Rhaenyra. 
Gavin Spokes as Lord Lyonel Strong, Master of Laws to King Viserys and Lord of Harrenhal.  
Savannah Steyn as Lady Laena Velayron, daughter of Corlys Velaryon and Rhaenys Targaryen.
