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.
Supergirl
Season Number:Â 6
Episode Number:Â 6
Episode Title:Â Prom Again!
Air Date:Â May 4, 2021
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