Supergirl is a 1984 superhero film. It stars Helen Slater in her first motion picture role in the title role of the DC Comics superheroine Supergirl. Faye Dunaway (who received top billing) played the primary villain, Selena. The movie was a spin-off from the popular Superman film series which lasted from 1978 to 1987 starring Christopher Reeve. The movie also featured Marc McClure reprising his role as Jimmy Olsen.

The movie performed poorly at the box office and failed to impress critics and audiences. Helen Slater, however, was nominated for a Saturn Award for her strong performance by the Academy of Science Fiction, Fantasy & Horror Films. The film does contain some expansions on the Superman movie mythology, such as taking the viewer into the Phantom Zone itself (in the first two Superman films, it was merely represented by a spinning black pane of glass). The story uses sorcery (a noted Superman weakness, but less favored over kryptonite) as a counter attack on Supergirl to great effect.

Released on video over the years by different companies, the film's first DVD release was on independent home video company Anchor Bay Entertainment in 2000 under license from StudioCanal. Warner Bros. recently acquired the rights to the film and reissued it on DVD late in 2006 to coincide with the reissues on DVD of the other Superman films. However, even though it is technically part of the same series of films as the ones produced between 1978 and 1987 with the late Christopher Reeve, it is not included in any of Warners' Superman-related 2006 box set DVD collections.

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 and unexpected obstacles when a mean spirited woman who practices rituals of the occult takes the power source for herself, and uses it to cause destruction and attempt zenith human status. Written by CoachTophie

Introducing a brand new superhero--the beautiful and mighty Girl of Steel in her very first adventure. Her name is Kara, and she's Superman's cousin from Krypton. Coming to Earth on a mission to save her dying city, Supergirl has to find and recover the Omegahedron, a source of almost unlimited power. But it's fallen into the hands of an amateur witch named Selena--who intends to use it to rule the world! To get it back, Supergirl has to fight not only evil humans, but the unimaginable forces of Black Magic (including a hundred-foot monster made of pure energy), and make a perilous journey into the forbidden depths of the Phantom Zone. Written by Robert Lynch