Lex Luthor is back and it looks as though he has some ill will towards Supergirl.
Supergirl episode 421, “The Quest for Peace,” has the episode title we’ve all been waiting for.
LEX LUTHOR RETURNS — Lex Luthor (guest star Jon Cryer) descends upon Washington, DC and summons Lena (Katie McGrath) and Lillian Luthor (guest star Brenda Strong) to the White House. Supergirl (Melissa Benoist) realizes she has one last chance to stop Lex and turns to the power of the press to help her.
Supergirl episode 422 airs on May 19, 2019.