Milly Alcock, born Amelia May Alcock on April 11, 2000, in Sydney, Australia, has quickly become one of the most recognizable faces in global entertainment. Best known initially for her portrayal of young Rhaenyra Targaryen in HBO’s House of the Dragon (2022), Alcock has now stepped into the superhero spotlight as Kara Zor-El, better known as Supergirl, in James Gunn’s revamped DC Universe. Her journey from a cafe worker in Marrickville to anchoring blockbuster franchises is a testament to her talent, resilience, and determination.
Alcock’s early career began with her debut in the Australian romantic drama series Wonderland (2014). She balanced acting with everyday life, working part-time jobs while pursuing roles in local television. Her performances in series like Reckoning, The Gloaming, and Fighting Season gradually built her reputation. However, it was her role in Upright (2019), where she played a runaway teenager opposite comedian Tim Minchin, that earned her critical acclaim and a nomination for Best Comedy Performer at the AACTA Awards, cementing her as one of Australia’s rising stars.
Her breakthrough came with House of the Dragon, where she portrayed the younger version of Rhaenyra Targaryen. Filmed during the pandemic, her performance captivated audiences worldwide and earned her a Critics’ Choice Television Award nomination. The role propelled her into international stardom, opening doors to Hollywood and beyond. After leaving the series, Alcock relocated to London to expand her career, later starring alongside Julianne Moore in Netflix’s Sirens (2025), where she played Simone, a complex character described as a “broken Barbie doll.”
In January 2024, Alcock was officially announced as the new Supergirl in the DC Universe. Following a rigorous audition process on the set of Superman (2025), she secured the role over several high-profile contenders. Her debut came in a mid-credits cameo in Superman, teasing her larger role in Supergirl (2026), which released on June 26, 2026. Alcock revealed that she drew inspiration from Tom King’s comic run Supergirl: Woman of Tomorrow, aiming to portray a grittier, unapologetic version of the character.
One of the most touching details about her preparation was the design of her Supergirl costume. Alcock shared that her cape was crafted using fabric from Christopher Reeve’s original Superman suit, symbolizing a bridge between legacy and modernity. With her fearless approach to acting and her ability to embody complex, powerful characters, Milly Alcock has firmly established herself as a global star. From Sydney’s inner-west to Hollywood’s biggest stages, her journey reflects the rise of a new generation of talent ready to redefine cinema and superhero storytelling.
