"Supergirl" Season 3, Episode 6, called "Midvale," will send Kara (Melissa Benoist) and Alex (Chyler Leigh) on a road trip to their hometown (also named Midvale), "where they will relive a murder mystery from high school that shaped their relationship as we know it."
Melissa Benoist told EW, "You'll get to see, through the way they interact, how their relationship started when Kara first came to Earth, how it grew, how it became so close and why they're so close nowadays."
"Supergirl" Season 3 previously announced that Kara's mother was being recast, with Erica Durance taking over the role Laura Benanti previously played on The CW show.
"Supergirl" Season 3 starts Monday, Oct. 9 at 8 p.m. ET on The CW.
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