Sorry, Charlie, but it sounds like Lena is staying in the dark — and that's just the way actress Katie McGrath wants it. ”I think it's important for Kara to have someone she doesn't have to be Supergirl with," McGrath says. ”If Lena knew the truth, she'd always be Supergirl. And she needs to be Kara. That's what this whole season is about, her struggling with her humanity. She has to be solely that person for somebody, and if that person has to be me, it makes me feel special."