Jon Cryer's Lex Luthor will return for Arroverse's "Crisis on Infinite Earths" crossover

Entertainment Weekly

“We’re excited to have you back,” Supergirl co-showrunner Jessica Queller said of Lex Luthor at the show's Comic-Con panel. “Hopefully you’ll stick around after that. You need to be nicer to your sister.” ALSO: Supergirl Season 5 adds Julie Gonzalo as Andrea Rojas and Staz Nair as reporter William Dey.