For other uses, see Fallout.
"Fallout" is the second episode of the fourth season of Supergirl, and the sixty-seventh episode overall. It aired on October 21, 2018.


A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the DEO. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation.[1]


  1. Supergirl - Episode 4.02 - Fallout - Press Release - SpoilerTV