Supergirl season 4 episode 15 will feature the arrival of the iconic DC villain Lex Luthor in the National City, making many fans excited with the upcoming episode. With John Cryer portraying the role, it further generated excitement among viewers.

Lex Luthor is one of the most iconic comic book villains ever, as per CarterMatt. He's evil and devious, and he's manipulative and smart. According to the synopsis of Supergirl season 4 episode 15, Lex was secretly furloughed from prison due to failing health. Then he visits his sister, Lena, to seek her help finding a cure. However, Lena isn't convinced and is suspicious about her brother's real motives.

But when she faced with a life and death situation, Lena needs to decide how she feels towards her brother. She needs to make her own decision, and she's the one who could only help him. No one knows what he's really up for, but he's planning a family reunion. The CW recently released some photos of the upcoming episode, showing Lex's big debut. The photos show that he's examining the top-secret her sister has been working on.

In November 2018, it was first announced Cryer would portray the role of the iconic villain. At that time, Supergirl executive producers Robert Rovner and Jessica Queller revealed he's they're dream actor to play Lex Luthor. They said Cryer is super-talented, and he portrayed the character of Lenny Luthor in Superman IV which brings additional layers on his legacy of acting.

But while many are anticipating for the arrival of Lex Luthor, there are more things to expect on Supergirl season 4 episode 14. For instance, Supergirl (Melissa Benoist) and J'onn (David Harewood) will be facing off against Manchester Black (David Ajala).

Then, James' sister Kelly (Azie Tesfai) also arrives in town. Fans are also excited about what she'll bring with her personality-wise to National City, especially for her brother to get to know him a little bit better. As per CarterMatt, one of the problems of this character is that he always exists as a foil for someone else. Also, he rarely ever gets to stand on his own two feet, so this might be a chance to deliver something new.

Supergirl season 4 episode 15 will air on March 3, 2019, on CW. Titled "O Brother, Where Art Thou?", the upcoming episode is directed by Tawnia Mckiernan and written by Derek Simon & Nicki Holcomb.