‘Supergirl’ EP Andrew Kreisberg On Kara & Maggie’s Fight To Save Alex; Rhea & Lena Luthor’s Meeting

Alex Danvers is in grave danger on Monday night’s “Supergirl.”

In the new episode, titled “Alex,” Kara’s Earth sister has been kidnapped by someone who is threatening to kill her if Supergirl doesn’t free a dangerous criminal from prison. 

Both Kara and Alex’s love — Maggie Sawyer — will spring into action. And although both of them will fight to save Alex, there will be conflict as they both approach trying to save her in different ways. How do they make good decisions when the life of the person they love is on the line?