In the Silver Age, Thara is the wife of Ak-Var, the assistant of her uncle Van-Zee, who later assumes the mantle of Nightwing.

After Brainiac captures and shrinks the city, Thara becomes its chief of security and the avatar of the deity Flamebird.

[2][3] After Superman liberates Argo City and Kandor, Thara moves to Earth and becomes the superhero Flamebird.

[4] In Superman: War of the Supermen, Thara sacrifices herself to save the remaining Kryptonians after Reactron destroys New Krypton.

She also possesses an undefined connection to the mythic "Flamebird" entity, which gives her pyrokinesis, immunity to gold kryptonite, and a psychic link with Chris Kent.