Lex Luthor’s name has often been mentioned in the first few seasons of Supergirl, but Superman’s arch-nemesis has never been seen on The CW’s hit super-series…until now. Kara will officially come face-to-face with her cousin’s most famous foe this season — although he won’t be appearing in the highly-anticipated “Elseworlds” crossover event.
Want to know what you need to know to watch the returning Arrowverse shows but missed some (or all) of the 370+ episodes so far? This video explains it all.