Did Reign manage to get to Ruby?
That was revealed on Supergirl Season 3 Episode 18 when the WorldKiller made it her mission to take down someone close to Sam.
Meanwhile, J'onn and Supergirl learned that Sam's mother could prove to be the key to finding out the truth about Reign, so they set off on a trip to get all the details.
Also, Alex had her work cut out for her on a mission to save someone she was caring for.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.