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Fan Theories About Supergirl

List RulesVote up the most plausible Supergirl fan theories.

The CW's Supergirl has taken the Superman canon and turned it on its head, giving it a whole new life, but that means the show totally leaves us guessing when it comes to, well, a lot. There's still so much we don't know about the show's badass superheroine and her Kryptonian heritage, but that's just the tip of the iceberg – that's also why so many fan theories about Supergirl and its characters have popped up over the years.

Are Supergirl and Smallville parallel universes? Is Lena Luthor really a good person? What's the deal with Mon-El? How does Batman fit into the CW show? Will Saturn Girl die in order to make way for Karamel once again?

There are plenty of mysteries on Supergirl, which means there's a dedicated group of fans trying to solve them. Some Supergirl fan theories are a bit far out – like one about Saturn Girl using mind control on Mon-El in order to keep their marriage going – while others make perfect sense. 

  • 1
    177 VOTES

    The Legion Has Traveled Back To Kara's Time To Change The Timeline

    Photo: Supergirl / The CW

    There's always been more to the Legion's arrival in Kara's time than meets the eye. In fact, Redditor /u/parduscat has theorized that the Legion has gone back in time to stop Kara from being killed by the Worldkillers – or becoming one herself. The logic is simple: if the Earth suffered a cataclysmic event in the 25th century, one can assume that it was at the Worldkillers' hands. This means that Kara was unable to defeat the Worldkillers on her own in the present day, which is why the Legion has come to help her out, ultimately altering the timeline in the process.

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  • 2
    202 VOTES

    Superman Met Mon-El In The Future

    Photo: Supergirl / The CW

    According to Redditor /u/meagancarter4, it's quite possible that the Man of Steel had already met Mon-El sometime in the future before the events of Seasons 2 and 3. When Kara visits the Fortress of Solitude in Season 1, it's revealed that Superman owns a Legion flight ring and has it on display in his HQ. This would seem to indicate that Superman has already crossed paths with the Legion – and Mon-El – by the time Kara visits the Fortress for the first time. 

    In Season 2, when Superman first "meets" Mon-El in the present day, the Man of Steel might actually be cracking a joke when he says Kara's boyfriend "must be a great guy." By this point, Superman would know for a fact that Mon-El is a good guy because they've gone on many adventures in the 25th century. 

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  • 3
    123 VOTES

    Harun-El Is Black Kryptonite

    Photo: Supergirl / The CW

    In season 3 of Supergirl, Kara is tasked with chasing down a MacGuffin, a black rock that goes by the name, Harun-El. Unfortunately for her, when she eventually finds it, she discovers that the rock has been allowing Kryptonians to live and breathe inside Argo city. Taking the entire rock would be devastating for the Kryptonians, so she decides to take only a small piece of the rock. According to Redditor /u/the3dtom, there might be more to this rock than meets the eye.

    "Kara touched it, therefore creating a second Kara (at the end of tonight's finale). Thoughts? Maybe they combined the Red Son storyline with the Black Kryptonite?"

    In the comics, Black Kryptonite actually splits Supergirl into two distinct personalities. The Red Son comic sees Superman land smack dab in the middle of Soviet Russia, rather than his traditional home of Kansas. It would definitely be interesting to see Kara split into both an evil and good version of her heroic persona, especially if it follows the comics and she ends up in Siberia. 

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  • 4
    161 VOTES

    Alex Is Going To Become A Mom

    Photo: Supergirl / The CW

    After realizing she was gay, Alex Danvers started a relationship with Maggie Sawyer, which ended when the couple couldn't compromise on having kids. Alex realized that she wanted to be a mom, while Maggie didn't want to be.

    Meanwhile, Sam has been losing it due to her Reign alter-ego, which could mean serious consequences for her daughter, Ruby. As Redditor /u/Shannaofthejungle points out, Sam losing her mother could mean that Alex will be able fulfill her desire to become a parent by adopting the young girl.

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