Supergirl: J'onn J'onzz Is in Line for a Devastating Shock

[Warning: The following contains spoilers from Monday's Supergirl. Read at your own risk!]

J'onn J'onzz (David Harewood) finally got a glimpse of hope on Supergirl when he discovered the Last Daughter of Mars, M'gann (Sharon Leal), was not only alive, but she was living in National City.

Both J'onn

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