Lena's ex-boyfriend comes to National City to unveil his nano-technology breakthrough; Lena asks Kara to attend Jack's conference with her for support.
A large bounty is put out on Supergirl and aliens from far and near attack National City intent on taking out the woman of steel.
A new villain comes to National City, putting Supergirl on high alert. Guest starring Teri Hatcher.
Alex searches for Jeremiah while Kara investigates a series of alien abductions.
When Jeremiah Danvers is rescued from Cadmus, Alex and Kara are thrilled to have their father back. The Danvers arrange a family dinner to celebrate but things go awry.
A magical imp shows up on Earth, and after declaring his love for Kara, begins to wreak havoc on National City. Alex and Maggie celebrate their first Valentine's Day together.
Metallo breaks Lillian out of jail and the evidence shows that Lena was responsible. Kara is the only one who believes that Lena is innocent, and sets out to prove it.
Armek, a white Martian, descends on National City intent on taking M'gann back to Mars to face her punishment as a traitor.
Livewire seemingly breaks out of prison; Supergirl takes Mon-El with her when she sees Livewire attack the NCPD; James wants to come clean with Kara; M'Gann has a psychic attack.
When Kara investigates the story of a missing woman, she and Mon-El end up being thrust through a portal to another planet where the downtrodden are sold as slaves.
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