Watch The Supergirl 4×02 “Fallout” Promo

The promo for the new episode of Supergirl has been released. This new episode is titled “Fallout” and it will air on October 21.

In this new episode, ” 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.”

Source: The CW