Cat isn't the only one who's back. We haven't seen Lillian Luthor in awhile, but it's not surprising she would show up after her daughter has been kidnapped by Rhea.

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Photo Credit:
Robert Falconer/The CW
Show:
Supergirl
Episode:
Supergirl Season 2 Episode 21: "Resist"
Related Photos:
Supergirl Photos, Supergirl Season 2 Episode 21 Photos
Location:
Vancouver / Burnaby, BC, Canada
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Supergirl Season 2 Episode 21 Quotes

Winn: Uh guys, I just picked up on some sort of live transmission from Air Force One.
Kara: Air Force One?
Alex: Wait, don't tell me the President is heading towards the conflict and not away.
Kara: Every time I think I can't get happier I voted for that woman...

Kara: James, I'm so glad you're okay.
James: Yeah, me too. It's a war zone out there. Daxamite troops are beaming down from everywhere, setting up checkpoints, arresting resisters. It's almost like they're instituting their own Martial Law.
Winn: Not to mention the full on Independence Day going out there with the mothership hovering over the city.