Spoilers for the Supergirl episode "I Believe In A Thing Called Love" featuring the return of Lex Luthor and a proposal
Preview clip and trailer for the Supergirl season finale "The Quest for Peace"
Preview images for the Supergirl Season 4 finale "The Quest for Peace" with Jon Cryer as Lex Luthor
Official CW description with sponsors for the Supergirl episode "The Quest for Peace"
