When Supergirl needs help, Alex asks Lena and Brainiac to team up; J'onn questions his decision to quit the DEO, but after running into Manchester Black he realizes there are a lot of ways to help his fellow aliens.
James falls in deeper with the Children of Liberty as he tries to meet Agent Liberty. Supergirl and Manchester Black chase a lead on Agent Liberty's location, but things take a dark turn. Lena begins her first set of trials.
Nia has a powerful dream about Agent Liberty but refuses to see it as a prophetic dream. Kara and Brainy try to convince Nia to embrace her destiny. Manchester Black pays Ben Lockwood a menacing visit.
Secretly furloughed from prison due to failing health, Lex Luthor visits his sister to seek her help; Lena is suspicious of Lex's motives, but when she's faced with a life and death situation, she must decide how she truly feels about her brother.
When a new team helps Manchester Black to break out of prison, Supergirl sets out to apprehend them. Meanwhile, a shocking new development regarding Ben Lockwood is revealed.