If Batman universe has the Joker, then Superman one has Lex Luthor. Anyone who has even the most basic knowledge of Superman knows that Luthor will always be his main nemesis and the dichotomy that these two have will always be a hallmark of the franchise.

It worked well for "Smallville" during the show's 10-season run, so it is a bit tough to say whether or not Lena Luthor (Cassidy Freeman) will serve the same purpose that her more popular brother does for the Man of Steel. In the latest episode of "Supergirl", viewers were able to see some glimpses of how Lena could become a mysterious piece of the puzzle for season 2.

In the episode aptly titled "Luthors", one of the most dysfunctional families on network television took center stage. This week we saw the return of Lillian Luthor (Brenda Strong), and Strong put on quite a convincing performance as the matriarch of the sinister Luthor family. As expected, Lillian is planning something bad, and her evildoing is starting to test the friendship of her daughter Lena with Kara.

"Luthors" is an episode that focuses primarily on the troubled mother-daughter relationship between Lillian and Lena, and the question of whether or not anyone from the Luthor family could ever be trusted. Viewers are even given a brief look at what Lena's childhood was like. While shows like "Arrow" sometimes get criticized for its reliance on flashbacks, the one shown in this episode of "Supergirl" was completely justifiable per IGN.

One of the most notable moments of the flashback scene was the first appearance of both Lionel and Lex Luthor. We still have no idea whether or not the adult Lex will ever appear on the show, so fans were at least able to get a little treat from the flashback sequence of this episode. The flashback also helped viewers understand why Lena's relationship with her mother is a bit rocky.

Trust is one of the overarching themes in this episode and Kara's greatest strength is shown in how she is able to see the best in everyone. Her more famous cousin also possesses this trait, so it's a bit refreshing to see Kara's struggles mirror that of Clark's. Kara still refuses to believe that Lena had something to do with her mother's escape from prison despite all of the signs pointing to the contrary.

As reported by Entertainment Weekly, almost everyone has reason to believe that it was Lena who broke her mom out of jail. Will Kara make the same mistake as her cousin did by putting all of her faith in a Luthor? The episode's final scene already casts some serious doubts on whether or not Lena is as innocent as she claims.