After finishing the "Justice League" series in 2006, Michael Rosenbaum has continued to work in film and television. While voicing the Flash, Rosenbaum portrayed another DC character in the live action Superman drama "Smallville." Instead of the heroic speedster, he played Superman's arch nemesis, Lex Luthor.
In 2012, Rosenbaum returned to voice the Flash in the direct-to-video animated feature "Justice League: Doom." He also provided the character's voice in the 2015 video game "Infinite Crisis." Rosenbaum expressed no ill will over not returning as Lex Luthor for the 2016 big screen adaptation of "Superman." As of 2015, his most recent project is "Impastor," a TVLand sitcom about a con man posing as a priest.