As it turns out, the flowing red cape and superhuman strength saving the day did not distrct avid watcher of 1984's Supergirl from the unexplained origins of the Phantom Zone mirror, or Selena's inability to tell Linda Lee apart from Supergirl despite her not owning a pair of hypno-glasses. Long before the DCU’s newest Girl of Steel took flight, Helen Slater introduced audiences to Supergirl in the 1984 cult classic that remains a nostalgic favorite to this day. Despite its enduring legacy, however, the film continues to leave viewers scratching their heads over a few story decisions that never quite added up.

Decades later, these two particular plot holes still stand out as some of the movie’s biggest unanswered mysteries. 

Released in 1984 and directed by Jeannot Szwarc, Supergirl builds its story around Kara Zor-El’s mission to recover the Omegahedron, the powerful energy source that keeps Argo City alive after it is accidentally lost in space. The artifact eventually falls into the hands of the ambitious witch Selena (Faye Dunaway), setting up the film’s magical final confrontation after Kara, played by Helen Slater, escapes the Phantom Zone and returns to stop her. It is during this climactic battle that the movie introduces one of its most enduring plot holes. 

After defeating Selena’s summoned Shadow Demon, Supergirl creates a powerful whirlwind that traps Selena, Bianca, and the demon before all three are pulled into a shattered mirror. Most longtime DC fans interpret the mirror as a gateway back to the Phantom Zone, largely because Kara herself had earlier escaped that prison dimension through what appears to be the very same portal after receiving help from her mentor, Zaltar. However, the film never explicitly establishes that the mirror remains an active Phantom Zone entrance, leaving audiences to connect the dots themselves rather than providing a clear in-universe explanation. 

That lack of clarity has kept the ending under discussion for more than four decades. Unlike modern superhero films, which typically spend considerable time explaining the rules behind mystical objects and alternate dimensions, Supergirl simply moves on once the villains disappear, never confirming exactly where they have been sent or whether they remain imprisoned. For many fans, the climax works well enough emotionally, but its missing explanation continues to stand as one of the film’s biggest unresolved plot holes. 

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Yet the Phantom Zone mystery is not the only moment that has puzzled audiences. If the film’s finale leaves one major question unanswered, Kara’s civilian identity creates another that becomes increasingly difficult to ignore as the story unfolds.

If the film’s ending leaves audiences with one major unanswered question, Kara’s secret identity creates another that proves just as baffling. After arriving on Earth, Kara adopts the civilian name Linda Lee while enrolling at an all-girls boarding school in Midvale, taking the surname after noticing a portrait of General Robert E. Lee in the office of school administrator Danvers. Curiously, while the inspiration behind “Lee” is obvious, the movie never explains where the name “Linda” comes from, making the Girl of Steel’s new identity feel oddly improvised from the very beginning.

The inconsistency becomes even harder to overlook as the story unfolds.  Throughout the film, Selena and her loyal companion Bianca repeatedly use their enchanted mirror to spy on both Linda Lee and Supergirl, watching them pursue the same mission and even appear in remarkably similar situations. Yet despite possessing a magical tool capable of revealing almost anything, Selena continues dismissing Linda as nothing more than “the wimp,” never realizing she is actually the very superhero standing in her way.

Ironically, the secret identity subplot opens the door to even more inconsistencies. The film portrays Kara as unfamiliar with several basic aspects of Earth life, from trees to everyday clothing, yet she somehow already knows that her cousin Kal-El lives as Clark Kent and effortlessly creates forged documents to support her own cover story. It also raises another lingering question: if the citizens of Argo City already knew Superman had survived on Earth, why had no one ever tried contacting him before Kara’s arrival? More than 40 years after its 1984 release, these unanswered questions continue to make Linda Lee’s secret identity one of the film’s most frequently debated plot holes.

With DC’s new Supergirl taking its flight in theaters on June 26, 2026, fans have plenty of reasons to revisit the franchise’s first solo outing. And while Helen Slater’s cult classic still shines with nostalgia, its biggest plot holes remain just as impossible to ignore more than four decades later.

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Which Supergirl (1984) plot hole still bothers you the most? And have you watch the latest Supergirl movie? Let us know in the comments.