Milly Alcock became one of the most talked-about young actors in the world after playing the young Princess Rhaenyra Targaryen in HBO’s fantasy drama House of the Dragon
Her performance was one of the early highlights of the series and quickly introduced her to a global audience.
Before House of the Dragon, Alcock had already built a promising acting career in Australia.
She appeared in television productions such as Janet King, A Place to Call Home, Pine Gap, The Gloaming and Upright.
However, playing Rhaenyra changed the scale of her career.
She plays Kara Zor-El, better known as Supergirl, in the 2026 film Supergirl. She also appeared briefly as the character in Superman.
Her career has therefore entered a new stage.
Instead of being remembered only as the young Rhaenyra from House of the Dragon, Milly Alcock is now building a film career around major international productions.
So who is Milly Alcock? How did she become famous? What has she done since House of the Dragon? And what is she working on next?
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Table of Contents
Who is Milly Alcock?
Milly Alcock is an Australian actress who was born on April 11, 2000, in Sydney, New South Wales, Australia. Her birth name is Amelia May Alcock.1
She grew up in Sydney and developed an interest in acting at a young age. Alcock attended Newtown High School of the Performing Arts in Sydney.
She left school in 2018 after being cast in the Australian television series Upright. Her early career was largely built around Australian television.
She worked steadily before receiving international attention. These early roles helped her gain experience across different genres and gave her an opportunity to develop as a performer.
Her major breakthrough came when she was cast as the younger version of Princess Rhaenyra Targaryen in House of the Dragon. The series premiered in 2022 and served as a prequel to Game of Thrones.
It focuses on the history of House Targaryen and the civil war known as the Dance of the Dragons. Alcock played Rhaenyra during the character’s younger years.
Her performance quickly became one of the most discussed parts of the first season.
What is Milly Alcock doing now in 2026?
As of September 2026, Supergirl is one of the main projects defining Alcock’s career. The film was released in theaters in 2026 and has since become available for streaming.
It remains an important part of the conversation around her next career stage. The movie’s reception and commercial performance have generated discussion but the role itself has established Alcock as part of the DC Universe.
She is also attached to the upcoming dark comedy Thumb. Thumb features Alcock alongside actors including Awkwafina, Kate McKinnon and Sofía Vergara.
The film is directed by Daina Oniunas-Pusić. The story centers on a lonely woman whose life changes after she receives a mysterious severed thumb in the mail.
The premise is very different from both House of the Dragon and Supergirl. That makes the project particularly interesting for viewers who want to see Alcock in a smaller and stranger story.
— Milly Alcock (@MillyAlcock) May 15, 2012
Quick Stats
| Category | Details |
|---|---|
| Full name | Amelia May Alcock |
| Known professionally as | Milly Alcock |
| Date of birth | April 11, 2000 |
| Birthplace | Sydney, New South Wales, Australia |
| Nationality | Australian |
| Profession | Actress |
| Active years | 2013–present |
| Breakthrough role | Young Rhaenyra Targaryen in House of the Dragon |
| Major television role | Meg Adams in Upright |
| Netflix role | Simone DeWitt in Sirens |
| Stage role | Abigail Williams in The Crucible |
| DC role | Kara Zor-El / Supergirl |
| Supergirl debut | Superman |
| Supergirl solo film | Supergirl (2026) |
| Upcoming film | Thumb |
| Planned DC return | Man of Tomorrow |
| Major award recognition | Critics Choice Television Award nomination |
| Education | Newtown High School of the Performing Arts |
Milly Alcock and House of the Dragon
House of the Dragon was the role that changed Milly Alcock’s career.2
The series had enormous expectations because it followed Game of Thrones. Taking on the role of Rhaenyra therefore meant entering one of television’s biggest fantasy worlds.
Alcock’s version of Rhaenyra was introduced as a young princess who was intelligent, independent and determined to understand her place within the Targaryen family. As the story progressed she faced political pressure and family conflict.
One reason viewers connected with Alcock’s performance was the emotional complexity she brought to the character. Rhaenyra was not presented as a simple hero.
She was ambitious and sometimes impulsive while also dealing with expectations placed on her because of her position. The role also required Alcock to work alongside major actors including Paddy Considine, Matt Smith and Rhys Ifans.
Her performance received significant critical attention. She earned a Critics Choice Television Award nomination for Best Supporting Actress in a Drama Series for her work on the show.
Although Alcock appeared mainly in the first season, her portrayal remained important to the show’s identity. When the story moved forward in time, Emma D’Arcy took over the role of older Rhaenyra.
That transition meant Alcock left the central cast much earlier than some viewers expected. However, leaving House of the Dragon did not mean the end of her rise. It gave her an opportunity to pursue different roles.
What did Milly Alcock do after House of the Dragon?
After her breakout role, Alcock did not immediately rush into another long-running fantasy television series. Instead, she explored different types of work.
One notable project was the West End production of The Crucible. Alcock played Abigail Williams in the stage production in London.
Moving from a major television production to theatre gave her another opportunity to demonstrate her range. She later appeared in the Netflix limited series Sirens as Simone DeWitt.
The series gave audiences another chance to see her outside the world of Westeros. Her career choices showed that she was interested in more than simply repeating the role that made her famous.
That became particularly clear when she accepted the role of Supergirl.
Milly Alcock as Supergirl
Milly Alcock’s next major career chapter is connected to DC Studios. She plays Kara Zor-El, also known as Supergirl, in the 2026 film Supergirl.
The movie is directed by Craig Gillespie and written by Ana Nogueira. The film draws inspiration from the comic book Supergirl: Woman of Tomorrow by Tom King and Bilquis Evely.
This version of Supergirl is different from the traditional image of a cheerful superhero. Kara is presented as a more complicated and damaged character.
She has experienced the destruction of Krypton and carries emotional weight from her past. The story follows Kara as she travels through space with Ruthye Marye Knoll, played by Eve Ridley.
Jason Momoa plays Lobo while Matthias Schoenaerts plays Krem. For Alcock, the role represents a significant move into blockbuster cinema.
She first appeared as Supergirl in Superman, directed by James Gunn. Her appearance connected her character to the new DC Universe and gave audiences their first look at Alcock’s version of Kara Zor-El.
The standalone Supergirl film then expanded that role.
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Why Supergirl is important for Milly Alcock’s career
The importance of Supergirl goes beyond one movie.3
Alcock’s performance in House of the Dragon established her as a recognizable television actor. Supergirl gives her the opportunity to lead a large-scale international movie franchise.
That is a major change in the type of role she is taking. Rhaenyra Targaryen belonged to an established fantasy world.
Supergirl is part of a new interconnected DC Universe that includes characters such as Superman and Lobo. The film also puts Alcock at the center of the story.
That means audiences who discovered her through House of the Dragon now have a completely different character to associate with her.
Her portrayal of Kara also gives her an opportunity to show a different side of her acting. Instead of playing a young royal learning how to survive a political world, she plays a superhero dealing with grief, identity and responsibility.
Will Milly Alcock return as Supergirl?
One of the biggest questions surrounding Alcock’s future is whether she will continue playing Supergirl.
The answer is increasingly connected to the wider DC Universe. Alcock is expected to return as Kara Zor-El in Man of Tomorrow, the planned Superman follow-up scheduled for 2027.
The project is set to feature David Corenswet as Superman. James Gunn is directing and co-writing the film with Peter Safran.
The planned return means Supergirl is not simply a one-film experiment for Alcock. Her character has a place in the continuing DC storyline.
This could make Supergirl one of the most important roles of her career. At the same time, Alcock’s future is not limited to superhero films because projects such as Thumb give her opportunities to explore other genres.
Milly Alcock’s acting style
One of the qualities frequently associated with Alcock is her natural screen presence. She does not rely entirely on traditional polished celebrity presentation.
Interviews and profiles have often highlighted her direct personality and her willingness to discuss the uncomfortable side of fame. Her performances also tend to have an understated quality.
As young Rhaenyra, she could communicate frustration and vulnerability without making every scene overly dramatic. In Supergirl, she has to balance humor with a character carrying significant emotional baggage.
That range is important as she moves into bigger film roles. An actor who becomes famous through one character can easily become closely associated with that role.
Alcock’s career choices suggest that she is interested in avoiding that limitation.
Milly Alcock’s early career before House of the Dragon
Before becoming internationally famous, Alcock spent years working in Australian television.
She appeared in productions including Wonderland, Janet King, A Place to Call Home, Fighting Season, Pine Gap, Les Norton, The Gloaming and Reckoning.
Her role as Meg Adams in Upright was particularly important to her early career. The series starred Tim Minchin and gave Alcock a substantial role before her international breakthrough.
These projects are worth remembering because they show that her success did not happen overnight. By the time she auditioned for House of the Dragon, she already had professional acting experience.
Why people are still searching for Milly Alcock
There are several reasons Milly Alcock continues to attract online searches.
First, House of the Dragon remains a major part of modern fantasy television. Even after her departure from the main story, fans continue to revisit the first season and her performance as young Rhaenyra.
Second, she has become part of the new DC Universe. Her transition from Rhaenyra to Supergirl gives audiences two very different high-profile characters to compare.
Third, her career is expanding into film. Supergirl represents a major blockbuster role while Thumb offers a completely different type of project.
This combination means there is still uncertainty about exactly what direction her career will take after her superhero debut.
What could be next for Milly Alcock?
The clearest confirmed direction is her continued connection to the DC Universe. Her role as Supergirl gives her the possibility of appearing across future DC projects.
Man of Tomorrow is currently one of the most important upcoming titles connected to that storyline. At the same time, Thumb could show whether Alcock wants to balance franchise filmmaking with smaller and more unusual movies.
That balance could become an important part of her career. Many actors who become famous through major franchises eventually seek projects that allow them to take more creative risks.
Alcock’s choices already suggest an interest in working across different formats. Her future filmography may therefore include both major studio productions and more unconventional projects.
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FAQ’s
Who is Milly Alcock?
Milly Alcock is an Australian actress best known internationally for playing young Princess Rhaenyra Targaryen in HBO’s House of the Dragon. She later became part of the DC Universe as Kara Zor-El or Supergirl.
How old is Milly Alcock?
Milly Alcock was born on April 11, 2000. She is 26 years old in 2026.
What made Milly Alcock famous?
Her international breakthrough came with House of the Dragon, where she played the younger version of Princess Rhaenyra Targaryen.
Did Milly Alcock play Rhaenyra in all of House of the Dragon?
No. Alcock played the younger Rhaenyra. Emma D’Arcy later took over the role as the story moved forward in time.
Is Milly Alcock Supergirl?
Yes. Milly Alcock plays Kara Zor-El, also known as Supergirl, in the new DC Universe.
Was Milly Alcock in Superman?
Yes. Alcock appeared as Supergirl in Superman, giving audiences an introduction to her version of Kara Zor-El before the standalone Supergirl movie.
Conclusion
Milly Alcock’s career has changed dramatically since she first appeared as young Rhaenyra Targaryen in House of the Dragon.
The role introduced her to a worldwide audience and established her as a performer capable of handling a major franchise.
At the same time, projects such as Thumb show that her career is not limited to blockbuster movies. That combination makes Alcock an interesting actor to watch in the coming years.
Her journey from Australian television to House of the Dragon and then to Supergirl has happened quickly.
For fans who first discovered her as Rhaenyra, the biggest question is no longer simply what happened to Milly Alcock after House of the Dragon.
The more interesting question is what she will do with the much larger platform she has now built for herself.
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