Milly Alcock

Amelia May Alcock (born 11 April 2000) is an Australian actress. She received an AACTA Award nomination for her performance in the Foxtel comedy-drama Upright (2019–2022). She gained wider recognition for starring as young Rhaenyra Targaryen in the HBO fantasy series House of the Dragon (2022–2024). Alcock is best known for portraying Kara Zor-El / Supergirl in the DC Universe, first making an uncredited appearance in Superman (2025). She reprised the role starring in Supergirl (2026).

Amelia May Alcock was born on April 11, 2000, in Sydney, Australia, and raised with three siblings in the city's inner west. She started acting as a child — commercials, small roles in Australian series like Janet King (2017) and the Netflix thriller Reckoning (2019–2020) — and made a decision that would define her career before it had really started: she dropped out of the prestigious Newtown High School of the Performing Arts to take a lead role in the Foxtel road comedy Upright (2019–2022). Opposite Tim Minchin, she played Meg, a runaway teenager crossing the Australian outback with nothing but attitude and a piano — a performance that earned her an AACTA Award nomination and showed, in full, the mix of toughness and vulnerability that would become her signature. The gamble paid off. Dropping out of school for a role is exactly the kind of bet you only take if you know.

In 2021, Alcock auditioned for an HBO fantasy series and won the role of young Rhaenyra Targaryen in House of the Dragon (2022), the Game of Thrones prequel. She had five episodes. It was enough. Alcock's Rhaenyra — defiant, wounded, magnetic — electrified the show's first season, and when the story's time jump replaced her with Emma D'Arcy, the audience revolted. Fan edits, tribute videos, think pieces: the internet had decided that Alcock was the realm's delight, and losing her was the show's great heartbreak. Doing in five episodes what most actors spend careers chasing — that's not a performance, that's a takeover.

The industry noticed what the fans did. Between seasons, Alcock headlined Netflix's black-comedy miniseries Sirens (2025), proving she could carry an American production. Then, in January 2024, James Gunn announced her as Kara Zor-El — Supergirl — in the rebooted DC Universe. Alcock has told the story of how she celebrated: she bought "the cheapest champagne at the Bottle-O" in Sydney and invited all her friends over to drink and dance. Gunn himself confirmed the casting in an email, which Alcock found hilariously insufficient: "Do call me, man! This is a calling conversation."

She made her DCU debut in a post-credits cameo in Superman (2025), then headlined Supergirl, released June 26, 2026. Directed by Craig Gillespie from Ana Nogueira's script and inspired by Tom King's Supergirl: Woman of Tomorrow, the film sent Kara on a revenge mission across the galaxy to avenge her dog Krypto's poisoning, with Jason Momoa chewing scenery as the bounty hunter Lobo, Matthias Schoenaerts as the villain Krem, Eve Ridley as young Ruthye Marye Knoll, and David Corenswet returning as Superman. The premiere took over the Brooklyn Academy of Music on June 22, 2026. Reviews were mixed — critics called it underpowered, though most praised Alcock's grunge-attitude take on Kara — and the box office disappointed, grossing roughly $126 million worldwide against a reported $170 million budget.

But DC Studios isn't done with her. Alcock is confirmed to return as Supergirl in Superman: Man of Tomorrow (2027), with DC Studios co-president Peter Safran calling the character "a major part of what we're doing." Beyond the cape, her slate keeps growing: the Daina Oniunas-Pusić film Thumb alongside Sofia Vergara and Kate McKinnon, a Takashi Miike and Charli XCX horror project filmed in Japan, and the thriller Hot Mother with Toni Collette. The five-episode wonder is building a career, and she's doing it the same way she started — betting on herself.

Milly Alcock did in five episodes what most actors spend careers chasing: she made the internet fall in love. As young Rhaenyra Targaryen in House of the Dragon (2022), the Australian actress brought a wounded, defiant fire to the Targaryen princess — and when the show time-jumped past her, the audience revolted. That's not a performance. That's a takeover.

She'd earned it. Alcock came up through Australian TV, breaking out in the road comedy Upright (2019–2022) with an AACTA-nominated turn that showed the same mix of toughness and vulnerability. The industry noticed what the fans did: this is a star, not a guest spot.

Now comes the cape — cast as Supergirl in James Gunn's DCU, debuting in Superman (2025) before her solo film. From Westeros to Krypton in three years. The realm's delight is just getting started.