As the country is rocked by a shocking revelation about the President, Mercy Graves targets the alien masking technology inside L-Corp. After Brainy and Nia feel the sting of anti-alien bias first-hand, Nia turns to James Olsen to intervene.

U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.

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CHAOS IN NATIONAL CITY

A shocking revelation causes chaos in National City. Supergirl (Melissa Benoist) sets out to capture Mercy Graves (guest star Rhona Mitra), while Alex (Chyler Leigh) takes control at the DEO. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena (Katie McGrath) if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy (Jesse Rath) meets Nia (Nicole Maines) and the two end up in a precarious situation.

Harry Jierjian directed the episode with story by Dana Horgan and teleplay by Maria Maggenti & Daniel Beaty (#402).