Milly Alcock

Milly Alcock is an Australian actress who has risen to international stardom through her work in both prestige television and superhero franchises. Born in Sydney, she began acting as a teenager in Australian productions before capturing global attention.

Alcock first gained recognition for her roles in Australian series including Upright (2019) and The Gloaming (2020). Her breakthrough came when she was cast as young Rhaenyra Targaryen in HBO’s House of the Dragon (2022), the Game of Thrones prequel series. Her portrayal of the young princess earned widespread acclaim and introduced her to a massive international audience.

Though her House of the Dragon role was limited to the first season (with Emma D’Arcy playing the older Rhaenyra), Alcock leveraged her success into a major superhero franchise role. She was cast as Kara Zor-El/Supergirl in James Gunn’s new DC Universe, debuting in the 2025 film Superman and set to lead her own standalone Supergirl film.

Variety named Alcock a “Star to Watch” in 2025, recognizing her rapid ascent from Australian television to Hollywood tentpole productions. Her combination of dramatic depth and action capability has made her a sought-after talent for major franchises.