Milly Alcock

Amelia May Alcock (born 11 April 2000) is an Australian actress best known for her roles in television and film. She achieved widespread recognition for starring as young Princess Rhaenyra Targaryen in the HBO fantasy series House of the Dragon and portraying Kara Zor-El / Supergirl in the DC Universe. She is also recognized for her performance as runaway teenager Meg in the Foxtel comedy-drama series Upright.

Alcock was born and raised in the Sydney suburb of Petersham, Australia. She has two younger brothers, one of whom is rugby union player Albert Alcock. She was introduced to acting when she played Little Red Riding Hood in a school production of Little Red Rocking Hood at Taverners Hill Infants School. She later attended Stanmore Public School and Newtown High School of the Performing Arts, dropping out in 2018 when she was cast in Upright. Prior to her major television roles, she lived with her family in Sydney and worked part-time at a cafe in Marrickville.

She made her television debut in a 2014 episode of the romantic comedy series Wonderland. Between 2015 and 2017, she presented on Disney Channel Australia's short-form series B.F. Chefs and Hanging With, while appearing in commercial advertisements for NBN, Cadbury, KFC, and Woolworths. In 2017, she secured her first named screen roles in the web miniseries High Life and the drama series Janet King. She subsequently appeared in television projects including Fighting Season, A Place to Call Home, Pine Gap, and Les Norton, and made her feature film debut in The School (2018).

In 2019, Alcock began starring in Upright, a role that earned her a Casting Guild of Australia Rising Star Award and a nomination for Best Comedy Performer at the 10th AACTA Awards. She returned for the show's second series in 2022, alongside supporting roles in The Gloaming and Reckoning. Her performance as young Princess Rhaenyra Targaryen in House of the Dragon (2022–2024) garnered critical acclaim and earned her a nomination for the Critics' Choice Television Award for Best Supporting Actress in a Drama Series.

Following her breakout role, Alcock relocated to London in 2022. In 2023, she appeared in the music video for "Easy Now" by Noel Gallagher's High Flying Birds and made her West End stage debut in The Crucible at the Gielgud Theatre. She later starred in the 2025 Netflix dark comedy limited series Sirens alongside Julianne Moore and Meghann Fahy. In the DC Universe, she made an uncredited appearance as Kara Zor-El / Supergirl in Superman (2025) before starring in Supergirl (2026), with plans to reprise her role in the film Man of Tomorrow.

In 2026, Alcock revealed that she had been diagnosed with ADHD.