“This episode is called ‘Alex,’ and there’s a guy who comes back from Alex and Kara’s past,” Chyler Leigh shared with TVLine in between scenes. “In the [Supergirl] pilot, you saw a young Kara miraculously save a girl from car. Well, this one guy saw her do it, and knowing that she had these powers, he figured out that Kara is Supergirl.”
Seeing an opportunity, this man puts in motion a “big, elaborate setup” that targets Alex and compels Supergirl to spring a dangerous individual from prison. When Alex goes missing during this ordeal, it will take the combined efforts of two of the people closest to her to hopefully save the day.
“Maggie and Kara have to team up to try to figure out what’s happened to me, and that sets up a lot of interesting conversations between the two ladies,” Leigh previews. “It’s almost like a peeing contest, you know what I mean? Like, ‘Who can do this better? Who knows Alex better?’ And it comes to a head at one point.”