Nia and Brainy attempt to save Supergirl from the Phantom Zone by time travelling back to Kara's home in 2009; a young reporter named Cat Grant sets her sights on Midvale as she suspects there is a big story in the small town.
Flashbacks reveal young Kara experiencing kryptonite for the first time; Nia and Brainy are trapped by invading aliens; a young Cat Grant may be the reason Supergirl never gets out of the Phantom Zone.