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'Supergirl' season 5: Kara goes up against Leviathan, here's what we know about the enigmatic organization teased in season 4's finale

Not much is known about Leviathan other than that they seem to have agents hiding in plain sight. If the show's version of the organization is anything like its comic book equivalent, it could mean doom for Supergirl and her sister Alex Danvers

When 'Supergirl' Season 5 arrives, the show's star superhero Kara Danvers/Supergirl (Melissa Benoist) is going to have a lot of things on her plate. Not only will she have to prepare for the coming 'Crisis on Infinite Earths' and face whatever Lena Luthor (Katie McGrath) has planned for her, but the season 4 finale teased Kara will also have to deal with an enigmatic organization known as Leviathan.

Not much is known about Leviathan other than that they seem to have agents hiding in plain sight. The finale revealed that Eve Teschmacher (Andrea Brooks) was secretly working for the organization. She meets an old lady who tells her she failed her mission before revealing “Leviathan is everywhere. Leviathan is everyone. And Leviathan is coming.”

Right now, Leviathan is a pretty prominent name in DC comics thanks to Brian Michael Bendis and Alex Maleev's 'Event Leviathan' limited series. Though the organization was first formed by Batman's enemy and occasional lover Talia al Ghul, during 'Event Leviathan' she loses control to a mysterious new figure whose identity is still unknown.

In the comics, Leviathan manages to decimate every major player in the intelligence community including Kobra Cult, the Department of Extranormal Operations (D.E.O.) and A.R.G.U.S.,  in just 24 hours. If the show's version of the organization is anything like its comic book equivalent, it could mean doom for Supergirl and her sister Alex Danvers (Chyler Leigh), considering their ties to the D.E.O. in the series.  

The best (and worst) thing about Leviathan is how little we actually know about the organization. Bendis has so radically transformed the group in the comics that we no longer have any reference point for how their introduction on the show might play out. All we know for sure is they are vastly powerful, they're coming for Kara and the Girl of Steel may not have what it takes to stop them. 

The cast of ‘Supergirl’ includes Chyler Leigh as Alex Danvers, David Harewood as J'onn J'onzz/The Martian Manhunter, Nicole Maines as Nia Nal, Jesse Rath as Brainiac 5, Katie McGrath as Lena Luthor, April Parker-Jones as Colonel Haley and Melissa Benoist as the titular hero Kara Danvers/Supergirl.

'Supergirl' Season 5 will begin airing on The CW October 6.