The Sam and Reign conundrum encompasses a lot of heartbreak for Kara, Benoist tells EW.
This episode really starts to explore the Luthor and Super relationship and the complexities of that, Benoist says.
Lest viewers forget, Lena is still unaware that Kara and Supergirl are one and the same.

Credit: Jack Rowand/The CW
Kara will, therefore, struggle in her interactions with Lena.
We explore that a lot in the following episodes, Benoist notes.
Still, Kara hasnt exactly been forthcoming with Lena, either.
So it is this moral dilemma that Supergirl is really struggling with.
I think its frustrating for Supergirl and Kara.
Obviously, theyre the same person, but I think its frustrating to have the alter ego.
I think its past the point of no return, she says.
Supergirlairs Mondays at 8 p.m.
ET on The CW.