Milly Alcock Has Officially Taken Flight as Supergirl in the New DCU — And Fans Are Already Debating What Kind of Kara Zor‑El We’ll Get

Australian actress Milly Alcock—best known for her breakout turn as Princess Rhaenyra Targaryen in House of the Dragon—is now officially fronting her own superhero era as Kara Zor‑El, a.k.a. Supergirl, in the revamped DC Universe (DCU). Alcock’s casting marks a major milestone in DC Studios’ ongoing franchise reboot led by James Gunn and Peter Safran, and the first full Supergirl film is set to arrive in theaters in summer 2026.

From Cameo to Center Stage

Alcock first appeared as Kara Zor‑El in a candid cameo at the end of the 2025 Superman movie, offering audiences their first glimpse of her version of the character. That brief post‑credits scene not only introduced her to DC fans but also set the tone for a more complex Supergirl than many have seen before.