House of the Dragon star Milly Alcock has landed her next TV role.

The actor, known for playing a young Princess Rhaenyra Targaryen in the Game of Thrones prequel, will appear in new Netflix series Sirens alongside Julianne Moore and The White Lotus' Meghann Fahy.

Alcock will play the sister of Fahy's character in the dark comedy, which is written and created by Maid showrunner Molly Smith Metzler.

milly alcock as young rhaenyra targaryen, house of the dragon season 2
HBO

Related: House of the Dragon's intimate Rhaenyra and Alicent scene let them down

"Devon (Fahy) thinks her sister Simone (Alcock) has a creepy relationship with her boss, the enigmatic socialite Michaela Kell (Moore)," reads the official Netflix synopsis.

"Michaela’s cult-ish life of luxury is like a drug to Simone, and Devon has decided it’s time for an intervention. Told over the course of one explosive weekend at a lavish beach estate."

Alcock took to social media to share her joy at being a part of the upcoming series, writing: "So excited to be part of this project with an army of incredible women both in front and behind the camera."

A release date and further cast for Sirens is yet to be announced.

julianne moore
JB Lacroix//Getty Images
meghann fahy
Taylor Hill//Getty Images

Related: House of the Dragon season 2 review

The House of the Dragon star has a busy year ahead with filming scheduled to take place on new film Supergirl: Woman of Tomorrow soon, after production on James Gunn's Superman: Legacy concludes.

In January, it was confirmed that Alcock had landed the titular role in the DC film, based on the comic book series of the same name.

"Milly is a fantastically talented young actor, and I’m incredibly excited about her being a part of the DCU," writer-director James Gunn wrote on Instagram at the time.

In May, Deadline reported the superhero film's provisional release date to be June 26, 2026. Cruella and I, Tonya's Craig Gillespie is directing.

House of the Dragon season two is available to stream on in the US on HBO and Max, and Sky Atlantic and NOW. Season one is available to stream now on HBO, Sky Atlantic and NOW.

Game of Thrones seasons 1-8 are also available on DVD and Blu-ray.

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