Supergirl: Woman of Tomorrow finally gives the Girl of Steel her own solo film for the first time in over forty years. Milly Alcock is set to star in the upcoming film, bringing to life the live-action latest rendition of Kara Zor-El, a.k.a. Supergirl. Woman of Tomorrow introduces Supergirl to a much larger universe in James Gunn’s DCU, a wide and sprawling franchise that aims to push DC characters into the mainstream in the same way that the Marvel Cinematic Universe has. If successful, Alcock’s superhero could become one of the primary faces of the DCU moving forward, putting even more pressure on the up-and-coming actress to excel in the role.

Milly Alcock beat out scores of other talented actresses for the role of Supergirl in the DCU, including Meg Donnelly, who voiced the character in several animated projects. The House of the Dragon star has James Gunn’s full support, but it has yet to be seen how DC fans will respond to the latest Supergirl actress. However, fans curious to see Alcock’s acting chops need look no further than her latest Netflix project, which reveals everything audiences need to know about her and the kind of Supergirl she will be.

Milly Alcock Shines in Netflix’s Sirens

Netflix’s Latest Miniseries Is an Excellent Display of Milly Alcock’s Acting Abilities

Image via Netflix

Sirens is Netflix’s latest hit original series based on the play Elemeno Pea by Molly Smith Metzler. The series follows Devon DeWitt (Meghann Fahey), who has grown very concerned for her younger sister, Simone (Milly Alcock), who resides at a high-class beach retreat, where she works as the personal assistant to ethereal billionaire Kiki Kell (Julianne Moore). Devon travels to the beachside resort, where she hopes to break through to her sister, who has become overly obsessed with appeasing Kiki and remaining in her good favor. Much to Devon’s chagrin, however, she finds that life on the Kell estate is far more cult-like than she had anticipated. Even worse, Simone is more deeply entrenched than she appeared, strongly resisting any show of help from her sister. Things unravel across five episodes as the dark comedy explores the extremely toxic relationship between Simone and Kiki, as well as Devon’s fruitless attempts to sway her sister back to the side of reason.

Sirens Cast & Character Guide

Character
Played By

Devon DeWitt
Meghann Fahey

Simone DeWitt
Milly Alcock

Ethan Corbin III
Glenn Howerton

Bruce DeWitt
Bill Camp

Jose
Felix Solis

Peter Kell
Kevin Bacon

Kiki Kell
Julianne Moore

Raymond
Josh Segarra

Missy
Britne Oldford

Patrice
Lauren Weedman

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As Simone, Milly Alcock exudes the energy and excitement necessary to inhabit a proper adaptation of Supergirl. The twenty-five-year-old actress seamlessly slips into the youthful exuberance of a devoted fan, coupled with a nervous energy that keeps her bouncing from scene to scene. However, there is much more going on beneath Simone’s energetic exterior than meets the eye. Throughout the series, viewers get a deeper look into the characters’ inner turmoil, giving Alcock a chance to show off her range. From dramatic scenes to humorous moments, Alcock is constantly stealing the scene, landing perfectly on all the right notes across her five episodes. She even manages to be sufficiently imposing when pushed to her limit, especially as her character continues to embrace a darker path. While Simone is surely a far cry from Supergirl as a character, Alcock uses her latest role to display her impressive range, putting all doubts to rest about whether she was the right choice for James Gunn’s DCU.

Milly Alcock’s Early Career Should Excite Supergirl Fans

Milly Alcock Shines in Several Major Productions

Image via HBO

Sirens is far from Milly Alcock’s only acting experience before Supergirl: Woman of Tomorrow. The actress first rose to popularity playing a young Rhaenyra Targaryen in the Game of Thrones prequel series House of the Dragon. Alcock only appears in the first half of the show’s freshman season, giving way to Emma D’Arcy’s more mature rendition of the character. In only a few episodes, Alcock managed to win the hearts of the Game of Thrones fandom, truly making Rhaenyra “the realm’s delight,” as she is known in Westeros. The young actress’s portrayal became so beloved that House of the Dragon found a way to bring her back for a guest spot in Season 2, despite the timeline moving on from her younger version of Rhaenyra.

Upcoming DCU Movies

Title
Release Date

Superman
July 11, 2025

Supergirl: Woman of Tomorrow
June 26, 2026

Clayface
September 11, 2026

The Authority
TBA

The Brave and the Bold
TBA

Swamp Thing
TBA

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Alcock has a history of leaving a major impression on audiences with her work, even when her screen time is limited. The Australian actress is fondly remembered for her roles in television series like Upright and A Place to Call Home. However, she has also taken the time to hone her craft on stage, appearing in adaptations of such classic shows as The Crucible in the ever-complicated role of Abigail Williams. With an already rather impressive career at such a young age, there is little doubt that Alcock will make the role of Supergirl her own.

When Will We Meet Milly Alcock’s Supergirl?

Supergirl May Appear Sooner Than Fans Think

Image via DC Comics

Milly Alcock is set to appear as Kara Zor-El in Supergirl: Woman of Tomorrow, which recently finished filming and is set to hit theaters on June 26, 2026. While this film will explore Kara’s origins, including the destruction of Krypton and her long, delayed journey to Earth, it may not be the first time that audiences meet Alcock’s DC character. It seems likely that Alcock will first appear in James Gunn’s upcoming Superman movie, which hits theaters this summer on July 11. Alcock was one of the first actors signed on to join the DCU, with Supergirl auditions taking place before Woman of Tomorrow was officially in production. This is an anomaly for Gunn, who has been vocal about leaving important casting decisions to the directors of specific projects. Alcock’s early casting suggests that she will appear in Superman, even if it is only for a brief cameo therein.

Upcoming DCU Series

Title
Release Date

Peacemaker Season 2
August 21, 2025

Lanterns
2026

Waller
TBA

Paradise Lost
TBA

Booster Gold
TBA

Untitled animated Blue Beetle series
TBA

Creature Commandos Season 2
TBA

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Alcock’s appearance in Superman can set up the relationship between Supergirl and her Kryptonian cousin. The two superheroes have a dynamic partnership in the comics, which has often been ignored in live-action retellings. Each is the last family that the other has after the destruction of Krypton, forcing the two survivors to rely on each other. Unfortunately, Superman and Supergirl never even interact in the DCEU, but the DCU can fix this mistake early on. If the rumors are true that Alcock will appear in Superman, then the DCU is already on the right track to delivering the definitive adaptation of Supergirl. Supergirl is in good hands with Milly Alcock and James Gunn. Alcock’s latest performance only leaves DC fans more excited for her debut as the iconic superhero, which will hopefully turn into a successful tenure in the DCU.