Who Is Milly Alcock? Age, Height, Supergirl Role & Career

She went from washing dishes in Sydney to suiting up as Kara Zor-El in one of DC’s biggest films of 2026. That is not a rags-to-riches cliché — that is the actual story of Milly Alcock. Before the cape, before the dragon, she was a teenager who dropped out of high school on a gut feeling. That decision changed everything. If you have heard the name and want the full picture — her age, height, Supergirl role, House of the Dragon run, personal life, and what comes next — it is all here.

Quick Facts: Milly Alcock at a Glance

How Old Is Milly Alcock and Where Was She Born?

As of 2026, Milly Alcock will be 26 years old, having been born on April 11, 2000. She grew up in Petersham, a vibrant inner-Sydney neighborhood in New South Wales, Australia. Her full legal name is Amelia May Alcock, though she has gone by “Milly” throughout her career.

She grew up alongside two younger brothers, Eddy and Bert Alcock. Her family was not connected to the entertainment world — by her own account, they were more interested in sport than the arts. That contrast, she has said, may be exactly what sparked her curiosity about performing.

Her first taste of acting came at Taverners Hill Infants School, where she played Little Red Riding Hood in the school production of Little Red Rocking Hood. She was around six years old. That small school stage turned out to be the starting line.

Milly Alcock’s Height, Look, and On-Screen Presence

Milly Alcock stands at 5 feet 5 inches (165 cm) tall and weighs approximately 55 kilograms. She has blonde hair, grey-blue eyes, and what many describe as a naturally expressive face — the kind that reads well on camera without needing heavy styling.

Her youthful appearance has been both an asset and a challenge. She has spoken openly about the tension of looking younger than her age: casting directors sometimes underestimate her range, while that same quality helped her believably portray a teenager in massive productions well into her twenties.

When she stepped into the role of Supergirl in 2025 and 2026, her physical transformation involved full body scanning for a custom suit build. The costume team at James Gunn’s DC Universe crafted the Kara Zor-El suit around her exact frame — proof that in blockbuster filmmaking, milly alcock‘s physical presence carries as much weight as her performance.

Where Did Milly Alcock’s Acting Career Start?

Milly Alcock made her screen debut in 2014 on the Australian series Wonderland. From there, she built a steady track record in Australian television through guest and supporting roles in A Place to Call Home, Janet King, Fighting Season, Pine Gap, and The Gloaming.

The turning point came in 2018. She was cast as Meg Adams in the Foxtel comedy-drama Upright, starring opposite Tim Minchin. The role required her to drop out of Newtown High School of the Performing Arts — a decision she made without hesitation. She told the Sydney Morning Herald, “I could not pass down Upright for a piece of paper.” That just seemed ridiculous to me.”

Upright ran from 2019 to 2022 and earned her an AACTA Award nomination for Best Comedy Performer, plus a Logie nomination for Most Outstanding Actress. It put her on the radar of serious Australian industry professionals. What happened next put her on the radar of the entire world.

Milly Alcock in House of the Dragon: Young Rhaenyra Targaryen

In 2022, HBO launched House of the Dragon — the prequel to Game of Thrones based on George R.R. Martin’s Fire & Blood. Milly Alcock landed the role of young Rhaenyra Targaryen, the princess at the center of the Targaryen civil war known as the Dance of the Dragons.

The audition process happened entirely over Zoom, with the character listed only as “YR” in the script. Alcock had not even watched Game of Thrones at the time — she was around ten when the original series premiered and had never caught up. A friend helping her prep the audition tape was the one who recognized the Arya Stark scene she was reading from.

When the call came that she had the role, she was at a friend’s house. She later described the feeling: “I just kind of sank to the ground.” She could not tell anyone for weeks.

What Made Her Performance Stand Out

Playing young Rhaenyra meant playing a character defined by stillness and status — something naturally at odds with Alcock’s self-described fidgety energy. Director Miguel Sapochnik and showrunner Ryan Condal coached her toward a different physicality. “They kept reminding me that there’s strength in stillness,” she told The Hollywood Reporter. “She doesn’t have to prove herself.”

The preparation was intense. She binge-watched all eight seasons of Game of Thrones in two weeks. She memorized passages of High Valyrian. She learned to ride horses and practiced on a mechanical dragon rig. The role required her to carry the entire first half of Season 1 — six episodes — as the emotional and narrative anchor of a $100 million production.

The result earned her a Critics’ Choice Television Award nomination for Best Supporting Actress in a Drama Series and a Saturn Award nomination. Critics compared her screen presence to Emilia Clarke’s early work on Game of Thrones. Milly Alcock appeared in seven episodes across Seasons 1 and 2, with a brief guest appearance in Season 2 as the character aged into Emma D’Arcy’s version of the role.

Key House of the Dragon Details

• Series: House of the Dragon (HBO, 2022–2024)
• Character: Young Princess Rhaenyra Targaryen
• Episodes: 7 (Seasons 1 and 2)
• Co-stars: Paddy Considine, Emily Carey, Matt Smith, Olivia Cooke
• Based on: Fire & Blood by George R.R. Martin
• Nomination: Critics’ Choice Television Award for Best Supporting Actress (Drama)

Milly Alcock as Supergirl: The DC Universe Casting

The casting of milly alcock as Kara Zor-El — better known as Supergirl — was announced in 2024. It is the kind of casting decision that defines a career, and for this production, it almost did not happen the way it should.

At her audition before director James Gunn, producer Peter Safran, screenwriter Ana Nogueira, and DC executive Chantal Nong, there was no official Supergirl costume available. The team dressed her in a blue long-sleeved shirt and a red skirt. Despite that, Safran later recalled the room’s reaction: “Everybody had tears in their eyes. She adds a lot of emotion to the character and wears her heart on her sleeve. “This is simply great,” we all exclaimed as we exchanged glances.

Nogueira put it simply: “We had really good actresses come in. It’s not even really about that. It’s just like, Milly’s the girl.”

Supergirl Film Details

• First appearance: Superman (2025) — uncredited mid-credits cameo as Kara Zor-El
• Co-star: Jason Momoa
• Character description: Kara Zor-El, a Kryptonian who survived trauma and loss, searching for identity while forced to fight for what she has left
• Universe: James Gunn’s DC Universe (DCU)
• Filmed in: UK

In a Vanity Fair interview ahead of the film’s release, milly alcock spoke about the pressures of stepping into a beloved character with a passionate fandom — for the second time in her career. “We have become very comfortable having this weird ownership of women’s bodies,” she said. “I can’t really stop them. I can only be myself.”

Milly Alcock’s Complete Movies and TV Shows List

The West End Chapter: Milly Alcock on Stage

Between House of the Dragon and her DC casting, milly alcock made a move that surprised many: she stepped onto the London stage. In 2023, she made her West End debut at the National Theatre’s Gielgud Theatre, playing Abigail Williams in Arthur Miller’s The Crucible.

The role is one of the most demanding in the American theatrical canon — a young woman whose choices drive a community to catastrophe. Critics praised the performance. Collider described her as fully portraying the nuances of a character often reduced to a caricature, giving Abigail a complexity rarely seen in the role.

Theatre is, by its nature, unforgiving. There are no cuts, no retakes, no editing to save a weak moment. The fact that milly alcock chose that environment, and earned strong notices, says something significant about where her ambitions lie.

Sirens (2025): Milly Alcock on Netflix

In 2025, milly alcock joined an all-star cast for Netflix’s limited dark comedy series Sirens, alongside Julianne Moore, Kevin Bacon, and Meghann Fahy. She played Simone DeWitt, the live-in personal assistant and confidante to a wealthy socialite whose influence borders on cult-like.

Critics described her character as a “broken Barbie doll” — polished on the surface, fractured underneath. The Guardian called the series “utterly addictive.” Alcock’s portrayal was singled out for showing a different texture than her dragon-riding royalty work — sharper, wrier, with a social climber’s calculated energy beneath the Lilly Pulitzer wardrobe.

Personal Life: Is Milly Alcock Married or Dating?

Milly Alcock is not married. As of 2026, she is in a relationship with British chef Joseph “Jo” Powell, who operates the London-based food project Schoolnights Ltd.

The couple went Instagram-official in June 2025, when Alcock shared a photo of Powell wearing an “I Love My Girlfriend” shirt. They made their first public red carpet appearance together at the 2026 BAFTA Film Awards on February 22, 2026.

Alcock has lived in London since around 2021, having relocated from Sydney. She is known for keeping her personal life relatively private despite her growing public profile.

Milly Alcock’s Net Worth in 2026

Milly Alcock’s estimated net worth sits at approximately $2 million USD as of 2026. This amount represents her total earnings from major HBO and Netflix films, Australian television, her DC Universe contract, and commercial endorsements, including previous ads for companies like Cadbury, KFC, and Woolworths.

Her trajectory strongly suggests that number will climb significantly. Leading a DC Universe franchise is a different financial category than supporting roles in cable drama, and Supergirl: Woman of Tomorrow is the first step in what appears to be a multi-film commitment.

Milly Alcock’s Rise: What Makes Her Different?

The entertainment industry produces talented actors regularly. Fewer of them possess the specific combination that makes milly alcock worth watching across formats — stage, streaming drama, dark comedy, blockbuster action — without feeling like she is recalibrating her core instrument between each one.

Several qualities define how she approaches work:

• Physical commitment. She learned High Valyrian for House of the Dragon, studied horse riding, trained on mechanical dragon rigs, and underwent full body scanning for the Supergirl suit.
• Willingness to go where the risk is. Choosing a West End stage debut between two massive screen projects is not a safe move. She did it anyway.
• Emotional directness. Every casting director and director who has worked with her uses variations of the same phrase: she wears her heart on her sleeve.
• Perspective that stays grounded. She auditioned for House of the Dragon while living in her mother’s attic and washing dishes. That context has not left her work.

Frequently Asked Questions About Milly Alcock

How old is Milly Alcock?

She was born on April 11, 2000, in Sydney, Australia. Her zodiac sign is Aries.

What is Milly Alcock’s height?

Milly Alcock stands at approximately 5 feet 5 inches (165 cm) tall. She has a slender, athletic build and has often noted that her compact frame and youthful appearance have shaped how she is cast.

Who does Milly Alcock play in Supergirl?

Milly Alcock plays Kara Zor-El, also known as Supergirl, in James Gunn’s DC Universe. She first appeared in the uncredited mid-credits scene of Superman (2025) and leads the standalone film Supergirl: Woman of Tomorrow (2026).

What did Milly Alcock play in House of the Dragon?

She played young Princess Rhaenyra Targaryen, the central character of the first season of HBO’s House of the Dragon (2022–2024). She appeared in seven episodes across Seasons 1 and 2 before the character aged into Emma D’Arcy’s portrayal.

Is Milly Alcock married?

No. Milly Alcock is not married. She is currently dating London-based chef Jo Powell. The couple went public on social media in June 2025 and made their first major red carpet appearance together at the 2026 BAFTA Film Awards.

What is Milly Alcock’s net worth?

Milly Alcock’s estimated net worth is around $2 million USD as of 2026, earned through television, streaming, film, stage, and commercial work. Her DC Universe role is expected to significantly increase that figure in the coming years.

What Comes Next for Milly Alcock?

The Supergirl: Woman of Tomorrow film in 2026 is not an endpoint — it is an opening chapter. James Gunn’s DC Universe is a long-term franchise build, and milly alcock is positioned as one of its key anchors. Man of Tomorrow (2027) already lists her as Kara Zor-El, confirming she will reprise the role.

Beyond DC, she has already shown she will not be boxed into superhero work. The combination of Sirens, The Crucible, and House of the Dragon speaks to an actor chasing range — not comfort.

Watch what she chooses next. The pattern so far is that every decision has been slightly bolder than expected.

Sources: Variety, The Hollywood Reporter, Hello Magazine, Screen Daily, StarNow, Parade, Marie Claire, Looper, NYLON, IMDB, Wikipedia