Emily Carey
HBO/Getty ImagesWhere you've seen her: Wonder Woman (as young Diana), the 2018 Tomb Raider remake (as young Lara), the BBC series Casualty.
Who she plays: young Alicent Hightower, daughter of Otto Hightower, Hand of the King, and BFFs with Princess Rhaenyra Targaryen.
Milly Alcock
HBO/Getty ImagesWhere you've seen her: Australian TV shows like Janet King and Upright, Netflix's Pine Gap, Starz's The Gloaming.
Who she plays: Princess Rhaenyra Targaryen, daughter of King Viserys I, in her younger years.
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Olivia Cooke
HBO/Getty ImagesWhere you've seen her: Ready Player One (as Art3mis/Samantha), Sound of Metal (as Lou), Bates Motel, Thoroughbreds.
Who she plays: an adult Alicent Hightower.
Emma D'Arcy
HBO/Getty ImagesWhere you've seen them: Prime Video's Truth Seekers (as Astrid), Hanna (as Sonia Richter), the film Mothering Sunday, the Toni Collette-starring mini series Wanderlust.
Who they play: Princess Rhaenyra Targaryen in adulthood.
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Matt Smith
HBO/Getty ImagesWhere you've seen him: Doctor Who, The Crown's first two seasons, the BBC Two series Party Animals, Last Night in Soho.
Who he plays: Prince Daemon Targaryen, younger brother of King Viserys and heir to the throne.
Paddy Considine
HBO/Getty ImagesWhere you've seen him: Dead Man's Shoes, Tyrannosaur, Hot Fuzz, HBO's The Outsider, Peaky Blinders (as Father John Hughes), In America.
Who he plays: King Viserys Targaryen, father of Princess Rhaenyra and brother to Daemon.
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Eve Best
HBO/Getty ImagesWhere you've seen her: The King's Speech (as Wallis Simpson), Lucky Man, Nurse Jackie (as Dr. Eleanor O'Hara), 2012's Much Ado About Nothing, Fate: The Winx Saga.
Who she plays: Rhaenys Targaryen, cousin of Viserys, who was passed over as heir to the throne.
Fabien Frankel
HBO/Getty ImagesWhere you've seen him: The Serpent (as Dominique Renelleau), An Uncandid Portrait, the Emilia Clarke-starring 2019 rom-com Last Christmas.
Who he plays: Ser Criston Cole, a knight of Dornish descent and son of the steward to the Lord of Blackhaven.
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Rhys Ifans
HBO/Getty ImagesWhere you've seen him: The Amazing Spider-Man (as The Lizard/Dr. Curt Connors), Notting Hill (as the eccentric roommate Spike), Harry Potter and the Deathly Hallows: Part 1 (as Xenophilius Lovegood), Snowden, Elementary, Berlin Station.
Who he plays: Otto Hightower, hand of the king to Viserys.
Sonoya Mizuno
HBO/Getty ImagesWhere you've seen her: Ex-Machina (as the robot Kyoko), Devs, Crazy Rich Asians (as the bride Araminta Lee), Maniac.
Who she plays: Mysaria, an ally to Prince Daemon.
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Steve Toussaint
HBO/Getty ImagesWhere you've seen him: Pine Gap, Prince of Pearsia: The Sands of Time, 1995's Judge Dredd, 2005's Shooting Dogs.
Who he plays: Lord Corlys Velaryon (also known as “The Sea Snake”), a renowned nautical adventurer who claims the largest navy in the world.
Graham McTavish
HBO/Getty ImagesWhere you've seen him: the Hobbit trilogy (as Dwalin), Rambo (as Lewis), Outlander (as Dougal MacKenzie/Buck MacKenzie), 24, Prison Break.
Who he plays: Ser Harrold Westerling, a knight of the Kingsguard .
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Sian Brooke
HBO/Getty ImagesWhere you've seen her: Sherlock (as Elizabeth/Eurus Holmes), Trying (as Karen), Good Omens, No Return, Body of Water.
Who she plays: Aemma Arryn, queen and wife to Viserys.
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