Supergirl (1984)

Helen Slater, Matt Frewer, Faye Dunaway, Brenda Vaccaro

After a power source for the community of Krypton survivors is accidentally whisked to earth, Kara-El, cousin to Superman and niece to Jor-El, chooses to go to earth to find it, and bring it back. Upon her arrival, she becomes just a powerful and Super as her cousin, but encounters dangerous battles