Image courtesy of Comics Continuum/Warner Bros. 2001

Justice League voices have been cast and some favorites are back:

George Newbern as Superman

Kevin Convoy as Batman

Phil LaMarr as Green Lantern

Susan Eisenberg as Wonder Woman

Maria Canals as Hawkgirl

Carl Lumbly as Martian Manhunter

Michael Rosenbaum as the Flash

Mark Hamill as the Joker

Clancy Brown as Lex Luthor

The Injustice Gang will appear as villians and will be comprised of Lex Luthor, the Joker, Cheetah, Solomon Grundy, Shade, Copperhead, and the Ultrahumanite. Other villians include, The Manhunters, as well as, many classic DC villians. Darkseid will not appear in the first 26 episodes, but will defintely appear if a second season is ordered.

Source: Comicscontinuum.com