Supergirl, Season 5

Alex:
Your choice to conceal your identity, it wasn't born out of a place of maliciousness. It was born out of love and compassion. You were just trying to protect your family. You were trying to protect Lena from people who could use that information to hurt us. And, look, I love Lena, too. I am deeply upset by what is going on. This is... this isn't just two friends that are in a fight. This is someone who has turned a corner.

Kara:
No, but this is not her. This is not our Lena.

Alex:
Well, who is our Lena? I mean... she knew that Lex was out of prison, and she said nothing. She kept Sam Arias locked in-in a subbasement at L-Corp, knowing that she was Reign, and she said nothing. She knows how to make kryptonite, and she kept that hidden from us. Lena is living her own double life.

Kara:
You are making her sound like a Luthor.

Alex:
Maybe that's because she is one. We can't put our faith in some distant hope that she's gonna do the right thing, and... when every single action that she has taken up until now points to the contrary. Okay, we have to stop her, Kara. The safety of the world depends on that.

Kara:
No, she is not Lex. I will not treat her like a villain.

Alex:
I know you won't. That's why I have to.