heres a nice article i found on voice acting, it solves many questions ive seen in this thread.
Warner Bros. Interactive today announced the cast list of actors lending their voices to Justice League Heroes, the game based on the DC Comics series.
The talent roster giving voice to the heroes will include: Ron Perlman (Hellboy, Blade II, Justice League TV series) as Batman; Michael Jai White (Spawn, Spawn: The Animation) as Green Lantern; Crispin Freeman (Viewtiful Joe, Kingdom Hearts II) as Superman; Courtenay Taylor (God of War, Call of Duty 2: Big Red One) as Wonder Woman; Chris Edgerly (Drawn Together, Chicken Little) as The Flash; Kari Wahlgren (The Wild, Steamboy) as Zatanna; and Daniel Riordan (Transformers: Robots in Disguise, Star Trek: Enterprise) as Martian Manhunter.
Among the actors portraying villains will be Peter Jessop (Spawn: The Animation) as Brainiac and Carlos Alazraqui (Reno 911, Duck Dodgers) as The Key. Additionally, Ralph Garman (Family Guy, KROQ-FM Los Angeles' Kevin & Bean morning show, The Joe Schmo Show) will voice Green Arrow, one of the game's unlockable super heroes.
Developed by Snowblind studios, Justice League Heroes is an action adventure game for PlayStation 2, Xbox and PSP. The League should convene Fall 2006.
Those are some awesome voice actors, although id rather see the tv cast. this is cool, though