"This is a paradigm shift. Aliens are among us. And for the rest of human history, there will only ever be "before Superman" and "after". I am protecting mankind from an extinction event. And if this pearl-clutching jury of my... peers... wants to put me behind bars for it, they are welcome to try. But know this. I will always have my thumb on the scales."
Lex Luthor at his trial
"The House of L" is the sixteenth episode of the fourth season of Supergirl, and the eighty-first episode overall. It aired on March 24, 2019.


In the wake of Lex Luthor’s return, the show flashes back to what he’s been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena.[src]


  • This is the first episode of the series to not feature Jesse Rath (Querl Dox) after being promoted to a series regular.
  • When Lex leaves prison, he leaves a hologram of himself, just like it was done in Superman II.
  • Lex says he learned to play chess from Anatoly Karpov a reference to the Russian chess grandmaster and former World Champion. He was the official world champion from 1975 to 1985 when he was defeated by Garry Kasparov.
  • Lex holding up the giant golden globe is similar to Atlas who in Greek mythology was condemned to hold up the celestial heavens for eternity after the Titanomachy.
  • The Supergirl double has the name "Linda Lee" while working at the bar. Linda Lee was one of Supergirl's secret identities in DC comics.
  • The title is a play on the House of El, Kara and Clark's biological family on Krypton.
  • In the final scene, the Supergirl double is wearing a costume identical to the one Superman wore in the Elseworlds story "Red Son". The storyline is similar also. In Red Son, Kal-El's ship landed in Russia and he was raised by the Soviet government.
  • Lex Luthor knows Kara Danvers is Supergirl.
  • A deleted flashback scene featuring Lex would eventually be used in "Confidence Women".


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