'Supergirl' - 10/21/2018 (Photo Gallery)

In the episode entitled "Fallout," 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.




Jesse Rath as Brainiac-5




(L-R): Jesse Rath as Brainiac-5 and Nicole Maines as Nia Nal




Nicole Maines as Nia Nal




Melissa Benoist as Kara/Supergirl




Melissa Benoist as Kara/Supergirl




(L-R): Nicole Maines as Nia Nal, Sean Hewlett as Franklin, Jaymee Mak as Mackenzie and Melissa Benoist as Kara/Supergirl




Melissa Benoist as Kara/Supergirl




(L-R): Mehcad Brooks as James Olsen/Guardian and Nicole Maines as Nia Nal




(L-R): Mehcad Brooks as James Olsen/Guardian and Nicole Maines as Nia Nal




Mehcad Brooks as James Olsen/Guardian




Mehcad Brooks as James Olsen/Guardian




(L-R): Nicole Maines as Nia Nal and Mehcad Brooks as James Olsen/Guardian