Rosenbaum debunked a false report on Twitter that he was joining Crisis on Infinite Earths, and even tagged Jon Cryer, who plays Supergirl's Lex Luthor. "I think they’d be nuts not to," Cryer responded. "But I don’t know anything that you don’t." Rosenbaum responded to Cryer: "Cryer, stop being so lovable. I swear to God."