*Spoilers for House of the Dragon below – you have been warned*
The most recent episode marked the end of the journey for actors Milly Alcock and Emily Carey, who play Rhaenyra Targaryen and Alicent Hightower.
Episode six, out Sunday 25 September, will see time in the fictional world jump forwards by 10 years and the actors will be replaced by Emma D’Arcy and Olivia Cooke, respectively.
Meanwhile, Laena and Laenor Valaryon actors Nova Fouellis-Mose and Theo Nate will also be replaced by Nanna Blondell and John MacMillan.
“It was brilliant, actually,” Smith, who plays Daemon Targaryen, E! News of the cast change, “because I think they’ve done brilliant work.”
He added: “It gave you a completely different context for the age thing to play off.”
Considine also praised the switch, saying: “Yeah, I loved it. I loved it because they were the same character, but they [had] different energy.”
Under 22-year-old Alcock’s stewardship, Rhaenyra was aged 15-17 in the show while 19-year-old Carey’s Alicent was supposed to be of a similar age.
Fans were distraught over the stars’ departure, particularly Alcock’s as she quickly won favour with fans for her performance as the young princess.
“Milly Alcock as young Rhaenyra Targaryen is one of the most perfect castings ever, I’ll never get over it,” one complained.
The change is made even more jarring by the fact that Aegon II, who is supposed to be around 14 in the series, will be played by 27-year-old actor Tom Glynn-Carney.
D’Arcy is eight years older than Alcock at 30 while Cooke is nine years older than Carey at 28.
House of the Dragon airs weekly on Sundays in the US, with the UK premiere arriving 2am the following morning on Sky. The episodes are then repeated at 9pm on Mondays, and will be available to stream on Sky and NOW after their initial airing.