Watch Supergirl Online: Season 3 Episode 18

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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. 

Use the video above to watch Supergirl online right here via TV Fanatic. 

Get caught up with all the latest super fun right now. 

Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.

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Supergirl Season 3 Episode 18 Quotes

Winn: Did Mon-El tell you about my dirt collection?
Brainy: No, I ran a diagnostic of your personality, and calculated with a 98..7% certainty that you either collected dirt or New York Mets baseball cards.

Winn: J'onn's going to be sad he missed you.
Mon-El: Tell him it's okay. I'll see him in a thousand years.