Katie McGrath as Lena Luthor
“Supergirl” star Katie McGrath said that she thinks Lena Luthor would feel a little betrayed if the L-Corp CEO found out in the Season 2 finale that Kara (Melissa Benoist) is actually the Girl of Steel. The CW

Despite Lena Luthor’s (Katie McGrath) close relationship with Kara (Melissa Benoist), the L-Corp CEO still seems to have no idea that Supergirl and her best friend are the same person. But will Lena finally find out the truth about Kara’s identity in next week’s Season 2 finale of “Supergirl”?

Entertainment Weekly asked that question to McGrath during a recent interview. And although McGrath didn’t really answer the query, the actress did say that she thinks it would be better if Lena remains clueless about Kara’s secret identity.

“Part of the fun is the fact that she’s one of the only people who doesn’t know, and that gives their relationship something different than she has with anybody else,” the Irish actress said. “With Lena, Kara can just be Kara; she can be Kara Danvers, not the superhero. She doesn’t have this weight and this responsibility on her. All she has to do when she’s with Lena is be a good friend. So I hope you, in a way, never see it, because what you have between the two is a very equal relationship. Lena doesn’t have to be this powerful corporate leader, she can just be a flawed human being, and so can Kara. The longer that you don’t ever see that, to me, the better.”

READ: Tyler Hoechlin teases battle between Superman and Kara in Season 2 finale of “Supergirl”

When asked how she thinks Lena would react if she learned that Kara is in fact the Girl of Steel, McGrath said that she thinks her character would feel a little betrayed but would ultimately understand why Kara kept her superhero identity a secret from her.

“She’s very accepting to aliens and people that are different, so why would she be any different with Kara?” McGrath said of Lena. “Absolutely she’d feel, in a way, betrayed and hurt that her friend hadn’t trusted her, but at the same time, I think she’s a very levelheaded person, so she understands that it would be difficult for Kara to ultimately trust a Luthor with that secret. ... I’d like to think she’d be very accepting of her best friend and the fact that her best friend is different.”

At the end of last week’s episode, Lena was rescued by her stepmom Lillian Luthor (Brenda Strong) with the help of Supergirl from the Daxamite mother ship. And although Lena is now safe from any immediate attack from Rhea (Teri Hatcher), McGrath teased that Lena will continue to be a huge part of the finale.

“I think it would be a mistake to underestimate a Luthor, in every good way and every bad way,” McGrath told TV Guide in a separate interview “They have never disappointed as a character, ever. Lena is no different. She is an extremely intelligent, strong, powerful woman. To think that she wouldn't have something to say about the destruction of National City and she wouldn’t have a role to play in that story would be mistaken. Don’t count her out.”

When asked what fans can expect from the Season 2 finale, McGrath said that the season ender “is completely action filled the whole way through.” “This is what [Greg] Berlanti productions does so well on The CW. They’ve created these shows that are like mini-movies,” McGrath continued. “‘The Flash,’ ‘Legends’ and ‘Arrow,’ this whole universe, these episodes and these TV shows are not like other TV shows. They are full of special effects and CGI and they are mini-movies. They are sit-on-the-edge-of-your-seat, white-knuckle rides. [The ‘Supergirl’ finale] just continues that. It doesn't give you a chance to breathe or question anything because any time you have a question, boom it’s answered....I don’t think anyone is going to be disappointed, trust me.”

“Supergirl” Season 2 finale airs on Monday, May 22 at 8 p.m. EDT on The CW.