The Hall of Justice has just been renovated, including a training facility with holographic training simulations. But when the holographic technology goes crazy, it doesn't take Batman and Superman long to discover that The Joker has been doing some secret renovations of his own! The two heroes send out a call for help to the rest of the Justice League—The Flash, Hawkman, Cyborg, Green Lantern—but The Joker has built in so many tricks and traps, it's not even funny. Who will have the last laugh? Stay tuned...