Official CW preview images for the Supergirl episode "Fallout" airing Oct. 21 on The CW

The CW has released some official preview images for “Fallout” which is the Sunday, October 21 episode of Supergirl.

You can find the new photos below, but first, a description:

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). Original airdate 10/21/2018

The new photos from the Supergirl episode “Fallout” can be found below.