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... (more) has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation.

Andrea Brooks, Anthony Konechny, Bruce Boxleitner, Christopher Webb, David Patrick Green, Ese Atawo, Fulvio Cecere, James Kot, Jaymee Mak, Keith Dallas, Kirby Morrow, Lissa Neptuno, Lynda Carter, Mathew Yanagiya, Rhona Mitra, Robert Baker, Sean Hewlett, Sean Kuling, Shaquan Lewis