S3E18
Episode 18: Shelter from the Storm
⚠ Spoiler alert This recap gives away what happens in this episode.
Episode Summary & Review
Lena provides Alex with a safehouse to protect Ruby from Reign, who is looking to severe the last ties of humanity that Sam has with her family. Meanwhile, Supergirl discovers that Lena has been manufacturing Kryptonite, and the Legionnaires depart for the future.