Ep 16. The House of L

In Supergirl season 4 episode 16, titled "The House of L", we see the return of Lena Luthor's brother, Lex Luthor. Lena has always been conflicted about her family's legacy and has tried to distance herself from them, but her brother's reappearance brings back old wounds and adds an even tougher decision to her plate. Meanwhile, Supergirl and her team try to uncover Lex's plans and put a stop to them before it's too late.

This episode delves deep into the history of the Luthor family and the toll it has taken on Lena. We see flashbacks to her childhood and the abuse she endured at the hands of her mother, as well as the emotional manipulation from her brother. Despite all that, Lena has tried to carve out her own path, using her intelligence and resources for good. But with Lex back in the picture, all of that is thrown into question.

Similarly, we see the lengths Lex is willing to go to in order to get what he wants. He is unpredictable, cunning, and has an army of loyal followers at his disposal. It's clear that he has a plan in motion, and it's up to Supergirl and her team to figure out what that is before it's too late.

Along the way, we see some touching moments between the characters. There are heart-to-heart conversations between Supergirl and Lena, as well as some comedic relief from Brainy and Nia. Additionally, we see how important family is to each of the characters. While Lena may not want to be associated with her family's legacy, she still loves her brother and wants the best for him (even if that means stopping him from committing mass destruction).

Overall, "The House of L" is a powerful episode that explores the complex dynamics of family and the lengths people will go to in order to protect those they love. It also sets the stage for the remainder of the season, as we see the fallout from Lex's plans and the consequences that come with going up against a genius like him.