Shazam Slam!

S1 E1: In the series premiere, Batman (KEVIN CONROY) helps an old man being mugged, who turns out to be a powerful wizard fighting off demons. A ghoul known as Calythos possesses the Parasite in order to drain the Justice League of its powers and use that stolen strength to open a massive volcano. When Batman gets possessed by an evil Djinn named Uthool, Superman and other members of the Justice League must battle the Dark Knight. When the JLA tries to stop the Brothers Djinn, the ghoulish trio are able to direct spells on our heroes by saying their names, forcing the heroes to disguise themselves as each other in order to foil the spells!