Supergirl (1984)

The film begins on the planet Krypton, where Kara Zor-El is shown alongside her parents Zor-El and Alura. After a large earthquake disrupts their peaceful lives, Kara's parents decide to send her to Earth to protect her. Navigating through a treacherous asteroid field, Kara manages to escape Krypton as it ultimately explodes.

She crash-lands near the town of Midvale, where she takes on the identity of Linda Lee and is enrolled in a boarding school. While adjusting to life on Earth, Linda befriends a quirky scientist named Ethan, who becomes infatuated with her and introduces her to his mentor, Nigel, who runs a rundown theme park named "The Midvale Fête."

Meanwhile, within the Phantom Zone, a powerful and evil sorceress named Selena has accidentally freed herself. She and her bumbling accomplice, Nigel, discover the Omegahedron, a source of immense power, which had been lost on Earth years before. Selena realises that the Omegahedron can grant her almost unlimited power and decides to use it to rule the world.

Selena arrives in Midvale and seduces Ethan, convincing him to help her acquire the Omegahedron. As Linda unknowingly possesses the artifact, Selena uses her magic to place Linda under her control, forcing her to do her bidding. However, when Selena discovers that Linda has taken over Supergirl's mantle, she turns Linda into a mindless zombie servant.

Supergirl, soon realizing that she has been deprived of her powers, visits her Kryptonian mentor, Zaltar, who confesses that he had accidentally let the Omegahedron slip through a portal to Earth while experimenting with it. Zaltar sacrifices himself to give Supergirl her powers back, promising to be with her always.

Supergirl locates Selena and confronts her at The Midvale Fête. A battle ensues, with Selena using her dark magic against Supergirl's newfound strength. Selena proves to be a formidable opponent, summoning various monsters and demons to fight against Supergirl.

Amidst the chaos, Ethan manages to break free from Selena's control and releases Linda from her zombie-like state. Linda then urges Ethan to bring her the recovered Omegahedron, which she intends to use to defeat Selena. Supergirl seizes the Omegahedron and gains enough power to finally defeat Selena.

With Selena defeated and her powers restored, Supergirl creates a second chance for Ethan by using the Omegahedron to reverse time and erase his memory of the events. She then returns the Omegahedron to its rightful place in Argo City, restoring peace and order.

In the end, Supergirl bids farewell to her friends on Earth, aware that she can always count on them. With her mission complete, she flies off into the sky, ready to face new adventures and protect the universe as Supergirl.