6 things you didn't know about DC's 'Supergirl' star Milly Alcock

Before Alcock got her big break in the HBO series she grew up in Petersham, in Sydney's inner west. She told Harper's Bazaar last year she's the only arty one out of her parents and two brothers.

"The arts felt like something that was just mine, that I had ownership over," she explained. "I really held onto that as a sense of independence and something I could call my own, I was very protective about it."

Alcock is also close to her mother, and told The Standard that she was upset that she couldn't be at the "House of the Dragon" premiere in London.

"My family can't come over. And it's just, I really wish my mum could be here, because this might never happen again. So it's kind of bittersweet ... things like this don't happen to people like me."

Alcock attended a public school in Sydney, but switched to Newtown High School of the Performing Arts when she was 13.

But when she realized most of her peers already had agents, she took matters into her own hands.

"So I started googling agencies and calling them saying, 'Hi, can you hire me?' Eventually one did. I think I was literally about 13 at the time," Alcock told Harper's Bazaar.

In 2018, Alcock dropped out school after being offered a leading role in Tim Minchin's comedy-drama "Upright."

She told Vogue she felt that learning on the job would be better for her career: "I knew that this opportunity would be so much more of a valuable experience than getting my piece of paper."

"I couldn't say no and I couldn't let the fear and anxiety of not finishing school haunt me, because that would have defeated the whole purpose of leaving," Alcock added.

Like many young actors, Alcock had a part-time job while looking for her next role. She was 20 when she landed the role of Rhaenyra Targaryen in the HBO series, and was still working at a café in Sydney at the time.

She decided to keep her job until production started in early 2021, telling Harper's Bazaar: "I was literally washing dishes every day. Nobody knew!"

When filming started, Alcock moved to London around the time the UK was in lockdown due to the pandemic.

"I didn't know anyone, and I'd never lived out of home for that long, and I was about to film what was potentially the biggest TV show ever. So yeah, it was a headfuck," she recalled.

While working on "House of the Dragon," Alcock got close with her costars Paddy Considine and Rhys Ifans, who played King Viserys I Targaryen and Otto Hightower respectively.

She told Complex that the pair suggested she listen to an Australian punk band called Amyl and the Sniffers.

"They were like, 'You need to check out this band, Amyl and the Sniffers.' I did, and I was like, 'Oh my God, they're fucking sick'," Alcock said.

It would be easy for Alcock to land another fantasy role after her sting in Westeros, but she wants to do something different.

"I'm not doing any fantasy roles. I don't want to do anything like that. I have done it and I don't need to do it again. I am just kind of waiting for the right project," she told the Herald Sun.

"I would rather work not a lot and do work that I am really proud of and passionate about," she added.

Hopefully, that says a lot about the potential for her role as Supergirl in Gunn's new DC Universe.