Supergirl - Episode 4.22 - The Quest for Peace (Season Finale) - Sneak Peek, Promo, Promotional Photos + Press Release By SpoilerTV (May 19, 2019, 5:25 pm)
“The Quest for Peace” — (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)
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. Jesse Warn directed the episode with story by Robert Rovner & Jessica Queller and teleplay by Rob Wright & Derek Simon (#422). Original airdate 5/19/2019.