Initially billed as Game of Thrones prequel, House of the Dragon has swiftly taken on an identity all of its own, with rave reviews and a dedicated following almost matching the original series. In it, Olivia Cooke plays Alicent Hightower, wife to the late King Viserys, whose machinations on behalf of her family have become increasingly dangerous, with devastating consequences. Emma D’Arcy plays her former friend, Princess Rhaenyra Targaryen, the eldest child of the King, named the rightful heir to his throne, whose claim is taken into question by Alicent. In the latest episode of our ‘One on One’ franchise, Cooke and D’Arcy sit down to discuss their on-screen rivalry, their off-screen friendship, and their experiences on the House of the Dragon set – with no spoilers!