Last year on Supergirl we were introduced to Lena Luthor (Katie McGrath), and she quickly became friends with Kara Danvers (Melisa Benoist). It was a move reminiscent of the Lex/Clark relationship on Smallville. You enjoy seeing them as friends and you want them to be friends, but you remember that one is a Kryptonian and the other is a Luthor. The writers of the series have gone a long way to show us that Lena is not Lex, even setting up a few situations that might have pushed her that direction only to have her come back to the side of the light. But that maybe changing soon.
As Lena goes up against Morgan Edge (Adrian Pasdar), her friendship with Kara will be tested as more of the Luthor side starts to come out. Benoist told EW.com:
"Kara is willing and ready to stand up for her best friend by any means possible. Lena's maybe [on a] slippery slope onto what you could sadly call her birthright. I don't know for sure, but it is a fragile balance beam that they're walking on, these two as friends in the way that Lex and Superman had."
McGrath was recently promoted to a series regular, and Lena is now the owner of CatCo — meaning she is integrated into all aspects of Kara's life now. If there is a falling out, it will be a big one.
Supergirl airs Mondays at 8 p.m. ET on the CW.