Supergirl hasn’t revealed any hints as to the true persona of the final Worldkiller, but speculation is rife that Angela Zhou’s upcoming character, Dr. Grace Parker might just be her.
Not to mention her worsening relationship with Supergirl which might eventually jeopardize her bond with Kara.
Speaking of personas, Lena keeping Sam’s real identity as Reign and attempting to turn her around appears like an already lost cause.
Meanwhile, Mon-El will need to finally sort his feelings for his wife Irma. Supergirl is back with brand new episodes every Monday night, 8 p.m. EST on The CW.
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Supergirl 3x15 Promo "In Search of Lost Time" (HD) Season 3 Episode 15 Promo