Supergirl star Milly Alcock was terrified her 'life was over at 22' after career slump Milly Alcock has revealed the moment she was "s***-scared" about her career prospects. 1 April 2026 Milly Alcock was "s***-scared" her life was over after House of the Dragon and Sirens. Milly Alcock reveals her career fears before Supergirl casting The 25-year-old actress - who is playing Kara Zor-El, AKA Supergirl, in the upcoming comic book blockbuster - was tempted to never take on another big franchise role after playing Young Princess Rhaenyra Targaryen in the Game of Thrones spinoff series, but she re...