Random Fan Theories About Supergirl (11 items)

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  (#1) Superman Met Mon-El In The Future

  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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  (#5) Harun-El Is Black Kryptonite

  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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  (#10) Saturn Girl Is Controlling Mon-El

  Karamel believers – as in Supergirl fans who want Kara and Mon-El to end up together – just won't accept Mon-El's marriage to Imra Ardeen (AKA Saturn Girl). While it was recently revealed that Mon-El actually married Imra in order to form an alliance between the people of Earth and the moon of Titan in the 25th century, some fans believe there is something more sinister afoot. 

  Redditor /u/psych_is_a_science has suggested that Saturn Girl is actually messing with Mon-El's head to keep him married to her. One of Saturn Girl's main powers is the ability to control minds, so this theory isn't so far-fetched.
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  (#9) Lena Luthor Is Finally Going To Turn Evil

  Ever since Lena Luthor was first introduced in Supergirl Season 2, fans have been waiting for the other shoe to drop. While Lena has remained the one good Luthor in the family, there is at least one fan who is not convinced. 

  Redditor /u/iwishiwasamoose has theorized that Kara and Lena's stories run so parallel – they're both adopted, one by a good family and the other by a bad one – that it's inevitable Lena will accept her destiny as a villain just as Kara accepted her heroic calling. 

  This theory is supported by some comments made by showrunner Jessica Queller, who told Digital Spy that Lena would be "a ticking time-bomb." Lena might have more in common with her infamous brother than first thought...
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  (#7) Saturn Girl Is Going To Die

  This theory derives from a trend we've seen before in the Arrowverse: one romantic interest dying in order to make way for a new one. Basically, if Mon-El and Kara are destined to be together, Saturn Girl has to die in order to make way for their reunion, according to Redditor /u/leloocat.

  Now that we know that Mon-El and Saturn Girl's marriage might not be a completely happy one (but one forged out of obligation), it would seem that this union is ill-fated and on its way out.
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  (#6) Reign May Redeem Herself

  It would be pretty sad to see Sam meet her end because of her Reign persona. After all, she's turned out to be one of Kara's best friends on the show. One fan is holding out hope that Reign may indeed defeat her own programming and set out on a path to redemption.

  Redditor /u/daemc97 says that the Legion might actually convince Reign to go back with them to the 25th century, where she can help them fight the problems of the future. Additionally, she might actually take Mon-El's place in the Legion since he'll want to stay with Kara in the present day. 

  The character swap certainly sounds like a signature Arrowverse move.

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