Milly Alcock opens up about about the challenges of House of the Dragon fame

Milly Alcock began her career in Australian comedy-drama Upright, but it was her role in Game of Thrones prequel House of the Dragon that really made her a household name, especially among geeks. She played Rhaenyra Targaryen in her younger years, before the character was ultimately taken over by Emma D'Arcy.

Alcock returned in House of the Dragon season 2 with guest appearances in episodes 3 and 4, although she is not expected to return for season 3 next year. In a recent interview with Forbes, the actress reminisced on landing the role as a 20-year-old, in the midst of COVID-19 pandemic lockdowns. Keeping her work a secret was particularly difficult, given that she had to travel to London. “I had to keep it quiet for four months. People were suspicious, but no one guessed that,” she recalled. 

After landing the role, she was thrust into the deep end of the industry, playing a key role in one of the most anticipated prequel shows ever. “I had no idea what it would become," she said. "And no one in my family works in film, so I didn’t have anyone to talk to who understood it. You’re thrown into this world with no reference points.” 

Milly Alcock "really struggled to believe" she could play Supergirl

House of the Dragon became HBO’s biggest debut since Game of Thrones. Following House of the Dragon, Alcock found herself a much-desired actress, going on to work on numerous other exciting projects. Earlier this year, she starred alongside Meghann Fahy in Netflix's dark comedy Sirens. She then made a cameo as Supergirl in the closing moments of the DCU's Superman. Alcock will return to helm her first solo Supergirl movie in 2026, which will undoubtedly be the biggest project of her career so far.

Naturally, when she landed the role of Supergirl, her initial reaction was both excitement and apprehension. “I thought, ‘What have I done?’" she said. “I really struggled to believe I could do it. I even called the director saying, ‘I don’t know how to be that person. I’m just me.’” 

As time passed and the gravity of the role settled, she started to gain confidence. “Eventually I realized the only way through was to trust myself,” she added. “I always believe life is right on time. Things happen when they’re supposed to, whether you feel ready or not.” 

Supergirl: Woman of Tomorrow is set to release on June 26, 2026.