Supergirl

When the power source for a lost Kryptonian outpost is flung into space, Superman's cousin Kara Zor-El (Helen Slater) rockets to Earth on a mission to retrieve it... but will the amazing powers she gains be enough to wrest the device from the scheming sorceress (Faye Dunaway) who's claimed it? Exciting first live-action incarnation for the Girl of Steel also stars Peter O'Toole, Hart Bochner, Mia Farrow, and Brenda Vaccaro.