Mind Wipe - Supergirl Season 4 Episode 10
In an effort to protect Supergirl's identity, Alex agrees to have her memory wiped which will obviously have some questionable consequences.

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The CW
Supergirl Season 4 Episode 10: "Suspicious Minds"
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Supergirl Season 4 Episode 10 Quotes

How do you think we keep this country safe? Every soldier in every war has had to things they considered awful. Now this is reality. Sometimes reality is messy. And it's ugly and uncomfortable. And you end up doing things you thought you'd never do.

Colonel Haley

Just because I don't work at the DEO anymore doesn't mean I'm going to stop being a hero. No matter what you say.