Julie Power was born in Richmond, Virginia to Dr. James Power and Margaret Power. She was a founding member of the superhero team Power Pack. The second oldest of the four Power siblings, she was 10 years old when she was given her powers by Aelfyre Whitemane, a dying Kymellian noble. She continued to operate with Power Pack through their entire history, later relocating to Los Angeles to live on her own after quitting the team in unrevealed circumstances.