After Alex sets out to find evidence against Lex, Brainy must decide between helping his friend or continuing to secretly work for Lex. Supergirl helps Winn face his greatest fear. The subsequent complications from the Crisis leave Supergirl to face a chaotic threat.ДЄs Supergirl tries to thwart a Toyman copycat, Winn Schott returns from the future. With their worlds in imminent danger, the superheroes suit up for battle while J'onn and Alex recruit Lena to help them find a way to save the people of Earth-38. The Monitor sends Harbinger to gather the worlds' greatest heroes - Supergirl, the Flash, Green Arrow, Batwoman, White Canary, the Atom and Superman - in preparation for the impending Crisis. Meanwhile, as Lena and Hope work to launch Project Non Nocere, Hope proves to be an invaluable asset to Lena. SupergirlвЂ™s struggle against Leviathan reaches a boiling point as she faces off against Rama Khan. J'onn J'onzz makes a discovery about his brother's whereabouts. Supergirl finally learns the truth about Lena while tangling with Leviathan. Meanwhile, Andrea and Lena think back on their tumultuous past. While a new villain is under arrest at the D.E.O., Supergirl uses him to try and understand who is responsible for the recent attacks. Kelly and Alex celebrate an anniversary, but Alex's safety is in jeopardy. On the eve of the worldwide launch of Andrea Rojas's VR contact lenses, Kara and William team up on an investigation that exposes a terrorist plot. Meanwhile, the conflict between Malefic and J'onn J'onzz reaches a boiling point, and Alok confesses his personal problem about working alongside Supergirl. Kara's investigation into William Dey's 'criminal' activities results in the shocking revelation he is not who she thinks. J'onn J'onzz takes a deep dive into his memories while Kelly tries to help an old friend. Kara attempts to mend her relationship with Lena. J'onn J'onzz and Kelly use Obsidian tech to solve a problem. Supergirl, Alex, and Brainiac thwart an alien attack while William investigates Kara. New couples emerge and explore their budding relationships while J'onn J'onzz receives an unexpected visitor. Kara is surprised to find that CatCo has a new owner who has brought in a star reporter.

Jeremy Jordan as Winn Schott/Computer Lad/Toyman and Winn Schott/Toyman.

Phil LaMarr and Ellexis Wejr as Malefic J'onzz.

David Harewood as J'onn J'onzz/Martian Manhunter and Hank Henshaw.

LaMonica GarrettВ as Mar Novu/The MonitorВ and Mobius/Anti-Monitor (voice).

Andrea Brooks as Eve Teschmacher and Hope.

Jesse Rath as Director Querl Dox/Brainiac 5.

Katie McGrath as Lena Luthor and Elizabeth Walsh.Chyler Leigh as Dr./Director Alex Danvers.Melissa Benoist as Kara Danvers/Supergirl.

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