Emma D’Arcy will be taking over the Rhaenyra role for the rest of the season (and beyond).
It begins with this moment.
Warning: This article contains spoilers fromHouse of the Dragonepisode 5.

Emma D’Arcy and John Macmillan take over the roles of Princess Rhaenyra Targaryen and Laenor Velaryon on HBO’s ‘House of the Dragon.'.HBO
Ahead of that switcheroo, the data pipe released a clip of D’Arcy’s very first scene.
“Let me take him,” Laenor offers to Rhaenyra as she carries the babe.
She’ll get no such satisfaction from that," his wife replies.
House of the Dragonairs every Sunday on HBO and streams on HBO Max.
Watch the clip above.