Supergirl 5.17 Preview

In the upcoming episode of "Supergirl," titled "Deus Lex Machina," Lex Luthor makes a return that Kara and all of National City will feel. The official CW synopsis reads: "LEX LUTHOR RETURNS - Lex Luthor (guest star Jon Cryer) returns to National City and reveals his master plan to Lena (Katie McGrath) - to destroy Supergirl (Melissa Benoist) and take over the world. Meanwhile, Supergirl and Martian Manhunter's (David Harewood) investigation leads them to a secret alien spacecraft that contains a powerful weapon that Lex is after." Watch the thrilling preview below to see what's in store!

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