Flashbacks reveal what Lex Luthor has been doing for the past two years.
Lex Luthor visits his sister to seek her help.
The aliens decide to have their own peaceful protest, when Lockwood organises a rally.
Kara and J’onn work together on an assignment.
Kara and Nia travel to Nia’s hometown to visit her family.
Supergirl, The Flash, Green Arrow and Superman face the battle of their lives.
Nia has a powerful dream about Agent Liberty.
Kara is feeling down after her televised debate with Ben Lockwood.
Colonel Haley makes a surprising decision regarding Supergirl.
When Supergirl needs help, Alex asks Lena and Brainiac to team up.
A shocking revelation causes chaos in National City.
The superhero drama delivers its strongest season yet.