Kara and Mon-El reach the meteor and discover there is a city on it. They are attacked by caretaker droids, but use disguises to blend in while traveling through the city towards the rock.
Mike invites Brandon to move in with him, which leads to an argument between Stef and Brandon. Meanwhile, Mariana objects to Jesus dating Lexi; and Callie’s journal assignment sparks memories of a dark secret from her past.
Lena and Mike disagree about whether to punish Brandon. Elsewhere, Jesus tries to cover for Mariana and puts his health at risk in the process, while Callie gets blamed for Mariana’s transgression; and Jesus and Lexi embark on a secret relationship.
Lena meets troubled teen Callie and asks her to temporarily move in with her family in the series premiere of this drama about a lesbian couple heading up a multiethnic family comprised of a biological son and a few adopted children.
Kara and James discuss Lena’s mistrust of Supergirl and keeping secret identities. Tonya, a Coville follower, brings Coville’s personal journal for James to give to Supergirl.
When the life of one of the doctors at Hope Zion Hospital is at risk, Alex has to put her personal and professional issues aside. Charlie has to deal with the ghost of a ballerina.