WATCH: Supergirl and Cat Grant Appeal to Superman for Help Against Myriad

On tonight's episode of "Supergirl," Kara discovers the truth about her aunt's secret weapon, Myriad. In the clips below, she seeks help from Superman and her boss, Cat Grant.

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In the first clip, Kara travels to Superman's Fortress of Solitude in order to find out more about Project Myriad. When she discovers that Kal-El is off planet, she tries to persuade Kal-Ex to tell her what Myriad can really do.

In the second clip, Non has launched Myriad and Kara discovers that Cat Grant is not effected by its mind-altering powers. While discussing how to save the city with Cat, she gets a text from Superman that he is on his way to help.

In the third clip, Alex Danvers comes home and gives her mother the shock of a lifetime when she introduces her to the unmasked J'onn J'onzz.

"Myriad" -- Kara must find a way to free her friends when Non and Indigo use mind control to turn National City's citizens into their own army, on SUPERGIRL, Monday, April 11 (8:00-9:00 PM, ET/PT) on the CBS Television Network.

"Supergirl" airs Mondays at 8 pm EST on CBS. Developed by producers Greg Berlanti, Ali Adler and Andrew Kreisberg, the series stars Melissa Benoist, Calista Flockhart, David Harewood and Chyler Leigh.

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