Why Does Superman’s Movie Cousin Supergirl Look So Familiar?

After James Gunn’s Superman, starring David Corenswet as the Man of Steel, Supergirl, starring Milly Alcock in the title role, will be released. What else has Alcock, who plays Supergirl, starred in?

Rated PG-13, Superman opens in theaters nationwide on Friday. Written and directed by James Gunn, the film avoids the origin story route and finds Superman as a fixture in Metropolis and his alter-ego, Clark Kent, working at the Daily Planet alongside Lois Lane (Brosnahan).

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The public turns its back on Superman, however, when the megalomaniacal Lex Luthor (Nicholas Hoult) executes a plot that suggests the Man of Steel has nefarious plans for Earth. As such, Superman must find a way to expose Luthor’s sinister intentions before the tech billionaire can carry them out and gain an insurmountable amount of power.

Note: A spoiler from “Superman” will be discussed in the next section.

Who is Milly Alcock, DC Universe’s New Supergirl?

As first reported by The Hollywood Reporter in April 2024, Alcock makes a cameo appearance in Superman as the superhero’s cousin Kara Zor-El — aka Supergirl — but for spoiler reasons, details of the scene will not be revealed here. The appearance merely marks the beginning of Alcock’s work in Gunn and fellow DC Studios co-CEO Peter Safran’s new DC Universe, as she is set to star in Supergirl, which is set for a June 2026 release.

Born April 11, 2000, in Australia, Alcock made her screen debut in a bit part in the Australian series Wonderland in 2014.

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Alcock’s breakthrough role happened in the 2017 Australian mini-series High Life, starring in the lead role as Isabella Barrett. From there, Alcock continued to hone her craft in her homeland with recurring or regular roles in a string of mini-series, including Pine Gap (2018), Fighting Season (2018), Les Norton (2019), The Gloaming (2020) and Reckoning (2019-2020).

From 2019 to 2022, Alcock had a starring role in the Australian road comedy series Upright, before moving on to a pair of major hit series that contributed to the actor's rise to stardom.

‘House Of The Dragon’ (2022-2024)

Milly Alcock stars as the young version of Rhaenyra Targaryen (Emma D'Arcy), who is destined to be queen but faces a horrible fate in House of the Dragon, the prequel series to Game of Thrones.

Alcock appeared in seven episodes in House of the Dragon in all — five episodes in Season 1 and two episodes in Season 2.

‘Sirens’ (2025)

Milly Alcock played one of the trio of lead roles in the Netflix hit dark comedy Sirens, a five-episode mini-series that premiered on the streaming service on May 22. The series debuted at No. 1 on Netflix’s Global Top 10 TV Shows chart and held the top spot for another week.

Alcock stars in Sirens as Simone DeWitt, the estranged younger sister of Devon DeWitt (Meghann Fahy).

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Looking for help to care for their ailing father (Bill Camp), Devon goes to retrieve Simone from her job as a personal assistant to the billionaire lawyer/socialite Michaela "Kiki" Kell (Julianne Moore).

When Devon arrives at Michaela’s estate and witnesses her bizarre behavior, she tries to convince Simone that her boss is running a cult.

What Can Audiences Expect From Milly Alcock’s ‘Supergirl’?

Milly Alcock was formally announced as Supergirl by James Gunn and Peter Safran’s DC Studios in January of 2024, reported The Wrap.

The film was originally called Supergirl: Woman of Tomorrow — based on Tom King’s and Bilquis Evely‘s comic book series of the same name — but the film’s title has since been shortened to Supergirl.

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Gunn told reporters (via The Hollywood Reporter) in early 2023 that the version of Supergirl in the new DCU is “not exactly the Supergirl we’re used to seeing.”

“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,” Gunn told reporters (via THR).

Directed by Craig Gillespie, Supergirl — starring Milly Alcock as Kara Zor-El/Supergirl — is set to open in theaters on June 26, 2026. Superman is now playing in theaters nationwide.

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