Milly Alcock to Star in ‘Supergirl: Woman of Tomorrow’

The ‘House of the Dragon’ actress had been screen-testing alongside ‘CODA’s Emilia Jones and ‘Zombies’ Meg Donnelly, but ultimately won the part.

(Left) Milly Alcock in 'House of the Dragon.' Photo: Ollie Upton / HBO. (Right) DC Comics' Supergirl from writer Tom King's 'Supergirl: Woman of Tomorrow.' Photo courtesy of DC.com.

Preview:

Milly Alcock has won the role of Supergirl the DCU.
She will first appear in James Gunn’s ‘Superman: Legacy’.
The character will also lead ‘Supergirl: Woman of Tomorrow’.

Supergirl: Woman of Tomorrow’.

House of the Dragon’, has landed the much-sought-after role in the DC Universe being overseen by Gunn and his fellow DCU boss/producer Peter Safran.

While such casting announcements –– this one came via The Wrap –– usually sit in the rumor sphere before the studio comments, Gunn has taken to Instagram to confirm Alcock’s presence in the DCU.

See his post below:

Where will Supergirl first appear?

DC Comics' Supergirl. Photo courtesy of DC.com.

Kara will initially show up first in ‘Superman: Legacy’, which Gunn is gearing up to start filming in March in Atlanta based on his own script.

The new Superman movie will star Sara Sampaio as Eve Teschmacher.

Supergirl: Woman of Tomorrow

Not Yet Rated Jun 26th, 2026

While Superman was sent to Earth and raised by incredibly loving parents, Kara was left on Krypton. For the first fourteen years of her life, Kara lived alone on... Read the Plot

What is the plan for the Supergirl movie?

DC Comics' Supergirl from writer Tom King's 'Supergirl: Woman of Tomorrow.' Photo courtesy of DC.com.

Once Supergirl has debuted in ‘Legacy’, she’ll then appear in her own movie, which was announced alongside the rest of Gunn and Safran’s plan for the first wave of their new movie/TV universe.

‘Supergirl: Woman of Tomorrow’ will be a big-scale sci-fi film based on Tom King and Bilquis Evely’s comic run. It features a “darker, harsher” version of Kara Zor-El raised on a surviving chunk of Krypton who sees everyone around her die.

This is what Gunn said at the time of the announcement:

“This is a very different type of Supergirl. In our film, we see the difference between Superman, who was sent to Earth and raised by loving parents from, you know, the time he’s an infant, versus Supergirl, who was raised on a rock chip-off of Krypton and watched everyone around her die and be killed in terrible ways for the first 14 years of her life, and then came to Earth when she was a young girl and is much more hardcore. She’s not exactly the Supergirl we’re used to seeing.”

Who else was in the running for Supergirl?

Emilia Jones in 'CODA'

Alcock got the role after an audition and a screen test, and the other two main contenders were Zombies’ movies.

Donnelly also had some experience with Supergirl, as she has voiced the role in several animated DC outings.

When will we see Alcock as Supergirl in theaters?

Milly Alcock in 'House of the Dragon.' Photo: Ollie Upton / HBO.

‘Superman: Legacy’ has a release date scheduled for July 11th, 2025. Given that it has yet to find a director, the Supergirl movie has yet to lock in a date.

Writer, director, co-chairmen and co-CEO of DC Studios, James Gunn and Superman.

(Left) Writer, director, co-chairmen and co-CEO of DC Studios, James Gunn. Photo courtesy of James Gunn's Twitter . (Right) Superman. Photo courtesy of DC Comics.com.