House of the Dragon showrunner was 'so proud' of Milly Alcock for getting Supergirl role

Milly Alcock, who compelled us all as young Rhaenyra Targaryen on House of the Dragon, is joining the DC Cinematic Universe, and House of the Dragon boss Ryan Condal couldn't be more proud.
House of the Dragon. Photograph by Ollie Upton / HBO
House of the Dragon. Photograph by Ollie Upton / HBO /

It's been a meteoric couple of years for 24-year-old Milly Alcock, who shot to fame as Rhaenyra Targaryen on HBO's Game of Thrones prequel show House of the Dragon. She was only around for five episodes, after which the show jumped forward in time and she was replaced by Emma D'Arcy, who plays the older version of the character. But five episodes was enough to convince the masses that Alcock was someone worth watching.

And since Alcock didn't have to come back for season 2 (sorry to any fans who were hoping for flashbacks to Rhaenyra's younger days), she was free to pursue other opporunities, including playing Kara Zor-El, aka Supergirl, in the new DC Cinematic Universe, which is currently being cobbled together by James Gunn and Peter Safran. Alcock will make her debut as Supergirl in Superman, which will star David Corenswet as the Man of Steel; that one's out on July 11 of next year. Then she'll return in Supergirl: Woman of Tomorrow, due out on June 26, 2026.

House of the Dragon showrunner Ryan Condal was clued in about Alcock's next chapter pretty early on. "We texted back and forth, but I had heard a rumor that she was up for it in the final running," he told Entertainment Weekly. "There was something else going on that I think her reps needed a letter from me or something like that for immigration. It was something very boring. So I was just texting with her to say, 'It's all taken care of. Let me know if you need anything else. By the way, are you Supergirl?' And then I got back a series of emojis that totally did not answer the question, but did intrigue me."

"When the news actually broke that she WAS, I said, 'This is incredible and I'm so proud of you.' She's just such a wonderful person and young actor. Sky's the limit in front of her now. Literally the sky's the limit because you will be flying through it. But it's just crazy to me, and I'm so proud of her and so happy for her, and I think it's great. I'm just hoping that she ends up filming at Leavesden [the U.K. studio where they shootHouse of the Dragon] so that we can hang out on each other's sets."

It's very cool to see Alcock's career explode so quickly and spectacularly. If the new DCU is a hit, she could follow in the footsteps of actors like Pedro Pascal, people who got their breaks in the Game of Thrones universe only to go on and conquer the world.

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